Collection of eight quadratic equations arranged in two columns for students to solve using the standard quadratic formula.
Worksheet with eight quadratic equations to solve using the quadratic formula.
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Step-by-step solution for: Quadratic Formula Worksheets (printable, online, answers, examples)
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Show Answer Key & Explanations
Step-by-step solution for: Quadratic Formula Worksheets (printable, online, answers, examples)
To solve each quadratic equation using the quadratic formula, we will follow these steps:
1. Identify the coefficients \(a\), \(b\), and \(c\) from the standard form of the quadratic equation \(ax^2 + bx + c = 0\).
2. Use the quadratic formula:
\[
x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}
\]
3. Substitute the values of \(a\), \(b\), and \(c\) into the formula.
4. Simplify the expression to find the solutions.
Let's solve each equation step by step.
1. Identify coefficients: \(a = 3\), \(b = -17\), \(c = -6\).
2. Apply the quadratic formula:
\[
g = \frac{-(-17) \pm \sqrt{(-17)^2 - 4(3)(-6)}}{2(3)}
\]
3. Simplify inside the square root:
\[
g = \frac{17 \pm \sqrt{289 + 72}}{6} = \frac{17 \pm \sqrt{361}}{6} = \frac{17 \pm 19}{6}
\]
4. Solve for the two possible values of \(g\):
\[
g = \frac{17 + 19}{6} = \frac{36}{6} = 6 \quad \text{and} \quad g = \frac{17 - 19}{6} = \frac{-2}{6} = -\frac{1}{3}
\]
1. Identify coefficients: \(a = 4\), \(b = -23\), \(c = 33\).
2. Apply the quadratic formula:
\[
r = \frac{-(-23) \pm \sqrt{(-23)^2 - 4(4)(33)}}{2(4)}
\]
3. Simplify inside the square root:
\[
r = \frac{23 \pm \sqrt{529 - 528}}{8} = \frac{23 \pm \sqrt{1}}{8} = \frac{23 \pm 1}{8}
\]
4. Solve for the two possible values of \(r\):
\[
r = \frac{23 + 1}{8} = \frac{24}{8} = 3 \quad \text{and} \quad r = \frac{23 - 1}{8} = \frac{22}{8} = \frac{11}{4}
\]
1. Identify coefficients: \(a = 24\), \(b = 22\), \(c = -7\).
2. Apply the quadratic formula:
\[
x = \frac{-22 \pm \sqrt{(22)^2 - 4(24)(-7)}}{2(24)}
\]
3. Simplify inside the square root:
\[
x = \frac{-22 \pm \sqrt{484 + 672}}{48} = \frac{-22 \pm \sqrt{1156}}{48} = \frac{-22 \pm 34}{48}
\]
4. Solve for the two possible values of \(x\):
\[
x = \frac{-22 + 34}{48} = \frac{12}{48} = \frac{1}{4} \quad \text{and} \quad x = \frac{-22 - 34}{48} = \frac{-56}{48} = -\frac{7}{6}
\]
1. Identify coefficients: \(a = 2\), \(b = -7\), \(c = 8\).
2. Apply the quadratic formula:
\[
h = \frac{-(-7) \pm \sqrt{(-7)^2 - 4(2)(8)}}{2(2)}
\]
3. Simplify inside the square root:
\[
h = \frac{7 \pm \sqrt{49 - 64}}{4} = \frac{7 \pm \sqrt{-15}}{4}
\]
4. Since the discriminant is negative (\(\sqrt{-15}\)), there are no real solutions. The solutions are complex:
\[
h = \frac{7 \pm i\sqrt{15}}{4}
\]
Rewrite in standard form: \(20b^2 + 11b - 4 = 0\).
1. Identify coefficients: \(a = 20\), \(b = 11\), \(c = -4\).
2. Apply the quadratic formula:
\[
b = \frac{-11 \pm \sqrt{(11)^2 - 4(20)(-4)}}{2(20)}
\]
3. Simplify inside the square root:
\[
b = \frac{-11 \pm \sqrt{121 + 320}}{40} = \frac{-11 \pm \sqrt{441}}{40} = \frac{-11 \pm 21}{40}
\]
4. Solve for the two possible values of \(b\):
\[
b = \frac{-11 + 21}{40} = \frac{10}{40} = \frac{1}{4} \quad \text{and} \quad b = \frac{-11 - 21}{40} = \frac{-32}{40} = -\frac{4}{5}
\]
1. Identify coefficients: \(a = 12\), \(b = 41\), \(c = 35\).
2. Apply the quadratic formula:
\[
g = \frac{-41 \pm \sqrt{(41)^2 - 4(12)(35)}}{2(12)}
\]
3. Simplify inside the square root:
\[
g = \frac{-41 \pm \sqrt{1681 - 1680}}{24} = \frac{-41 \pm \sqrt{1}}{24} = \frac{-41 \pm 1}{24}
\]
4. Solve for the two possible values of \(g\):
\[
g = \frac{-41 + 1}{24} = \frac{-40}{24} = -\frac{5}{3} \quad \text{and} \quad g = \frac{-41 - 1}{24} = \frac{-42}{24} = -\frac{7}{4}
\]
1. Identify coefficients: \(a = 5\), \(b = 19\), \(c = 18\).
2. Apply the quadratic formula:
\[
n = \frac{-19 \pm \sqrt{(19)^2 - 4(5)(18)}}{2(5)}
\]
3. Simplify inside the square root:
\[
n = \frac{-19 \pm \sqrt{361 - 360}}{10} = \frac{-19 \pm \sqrt{1}}{10} = \frac{-19 \pm 1}{10}
\]
4. Solve for the two possible values of \(n\):
\[
n = \frac{-19 + 1}{10} = \frac{-18}{10} = -\frac{9}{5} \quad \text{and} \quad n = \frac{-19 - 1}{10} = \frac{-20}{10} = -2
\]
Rewrite in standard form: \(6n^2 - 17n - 14 = 0\).
1. Identify coefficients: \(a = 6\), \(b = -17\), \(c = -14\).
2. Apply the quadratic formula:
\[
n = \frac{-(-17) \pm \sqrt{(-17)^2 - 4(6)(-14)}}{2(6)}
\]
3. Simplify inside the square root:
\[
n = \frac{17 \pm \sqrt{289 + 336}}{12} = \frac{17 \pm \sqrt{625}}{12} = \frac{17 \pm 25}{12}
\]
4. Solve for the two possible values of \(n\):
\[
n = \frac{17 + 25}{12} = \frac{42}{12} = \frac{7}{2} \quad \text{and} \quad n = \frac{17 - 25}{12} = \frac{-8}{12} = -\frac{2}{3}
\]
Final Answer:
\[
\boxed{
\begin{aligned}
&3g^2 - 17g - 6 = 0 \implies g = 6, -\frac{1}{3} \\
&4r^2 - 23r + 33 = 0 \implies r = 3, \frac{11}{4} \\
&24x^2 + 22x - 7 = 0 \implies x = \frac{1}{4}, -\frac{7}{6} \\
&2h^2 - 7h + 8 = 0 \implies h = \frac{7 \pm i\sqrt{15}}{4} \\
&20b^2 + 11b - 4 = 0 \implies b = \frac{1}{4}, -\frac{4}{5} \\
&12g^2 + 41g + 35 = 0 \implies g = -\frac{5}{3}, -\frac{7}{4} \\
&5n^2 + 19n + 18 = 0 \implies n = -\frac{9}{5}, -2 \\
&6n^2 - 17n - 14 = 0 \implies n = \frac{7}{2}, -\frac{2}{3}
\end{aligned}
}
\]
1. Identify the coefficients \(a\), \(b\), and \(c\) from the standard form of the quadratic equation \(ax^2 + bx + c = 0\).
2. Use the quadratic formula:
\[
x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}
\]
3. Substitute the values of \(a\), \(b\), and \(c\) into the formula.
4. Simplify the expression to find the solutions.
Let's solve each equation step by step.
Equation 1: \(3g^2 - 17g - 6 = 0\)
1. Identify coefficients: \(a = 3\), \(b = -17\), \(c = -6\).
2. Apply the quadratic formula:
\[
g = \frac{-(-17) \pm \sqrt{(-17)^2 - 4(3)(-6)}}{2(3)}
\]
3. Simplify inside the square root:
\[
g = \frac{17 \pm \sqrt{289 + 72}}{6} = \frac{17 \pm \sqrt{361}}{6} = \frac{17 \pm 19}{6}
\]
4. Solve for the two possible values of \(g\):
\[
g = \frac{17 + 19}{6} = \frac{36}{6} = 6 \quad \text{and} \quad g = \frac{17 - 19}{6} = \frac{-2}{6} = -\frac{1}{3}
\]
Equation 2: \(4r^2 - 23r + 33 = 0\)
1. Identify coefficients: \(a = 4\), \(b = -23\), \(c = 33\).
2. Apply the quadratic formula:
\[
r = \frac{-(-23) \pm \sqrt{(-23)^2 - 4(4)(33)}}{2(4)}
\]
3. Simplify inside the square root:
\[
r = \frac{23 \pm \sqrt{529 - 528}}{8} = \frac{23 \pm \sqrt{1}}{8} = \frac{23 \pm 1}{8}
\]
4. Solve for the two possible values of \(r\):
\[
r = \frac{23 + 1}{8} = \frac{24}{8} = 3 \quad \text{and} \quad r = \frac{23 - 1}{8} = \frac{22}{8} = \frac{11}{4}
\]
Equation 3: \(24x^2 + 22x - 7 = 0\)
1. Identify coefficients: \(a = 24\), \(b = 22\), \(c = -7\).
2. Apply the quadratic formula:
\[
x = \frac{-22 \pm \sqrt{(22)^2 - 4(24)(-7)}}{2(24)}
\]
3. Simplify inside the square root:
\[
x = \frac{-22 \pm \sqrt{484 + 672}}{48} = \frac{-22 \pm \sqrt{1156}}{48} = \frac{-22 \pm 34}{48}
\]
4. Solve for the two possible values of \(x\):
\[
x = \frac{-22 + 34}{48} = \frac{12}{48} = \frac{1}{4} \quad \text{and} \quad x = \frac{-22 - 34}{48} = \frac{-56}{48} = -\frac{7}{6}
\]
Equation 4: \(2h^2 - 7h + 8 = 0\)
1. Identify coefficients: \(a = 2\), \(b = -7\), \(c = 8\).
2. Apply the quadratic formula:
\[
h = \frac{-(-7) \pm \sqrt{(-7)^2 - 4(2)(8)}}{2(2)}
\]
3. Simplify inside the square root:
\[
h = \frac{7 \pm \sqrt{49 - 64}}{4} = \frac{7 \pm \sqrt{-15}}{4}
\]
4. Since the discriminant is negative (\(\sqrt{-15}\)), there are no real solutions. The solutions are complex:
\[
h = \frac{7 \pm i\sqrt{15}}{4}
\]
Equation 5: \(20b^2 + 11b = 4\)
Rewrite in standard form: \(20b^2 + 11b - 4 = 0\).
1. Identify coefficients: \(a = 20\), \(b = 11\), \(c = -4\).
2. Apply the quadratic formula:
\[
b = \frac{-11 \pm \sqrt{(11)^2 - 4(20)(-4)}}{2(20)}
\]
3. Simplify inside the square root:
\[
b = \frac{-11 \pm \sqrt{121 + 320}}{40} = \frac{-11 \pm \sqrt{441}}{40} = \frac{-11 \pm 21}{40}
\]
4. Solve for the two possible values of \(b\):
\[
b = \frac{-11 + 21}{40} = \frac{10}{40} = \frac{1}{4} \quad \text{and} \quad b = \frac{-11 - 21}{40} = \frac{-32}{40} = -\frac{4}{5}
\]
Equation 6: \(12g^2 + 41g + 35 = 0\)
1. Identify coefficients: \(a = 12\), \(b = 41\), \(c = 35\).
2. Apply the quadratic formula:
\[
g = \frac{-41 \pm \sqrt{(41)^2 - 4(12)(35)}}{2(12)}
\]
3. Simplify inside the square root:
\[
g = \frac{-41 \pm \sqrt{1681 - 1680}}{24} = \frac{-41 \pm \sqrt{1}}{24} = \frac{-41 \pm 1}{24}
\]
4. Solve for the two possible values of \(g\):
\[
g = \frac{-41 + 1}{24} = \frac{-40}{24} = -\frac{5}{3} \quad \text{and} \quad g = \frac{-41 - 1}{24} = \frac{-42}{24} = -\frac{7}{4}
\]
Equation 7: \(5n^2 + 19n + 18 = 0\)
1. Identify coefficients: \(a = 5\), \(b = 19\), \(c = 18\).
2. Apply the quadratic formula:
\[
n = \frac{-19 \pm \sqrt{(19)^2 - 4(5)(18)}}{2(5)}
\]
3. Simplify inside the square root:
\[
n = \frac{-19 \pm \sqrt{361 - 360}}{10} = \frac{-19 \pm \sqrt{1}}{10} = \frac{-19 \pm 1}{10}
\]
4. Solve for the two possible values of \(n\):
\[
n = \frac{-19 + 1}{10} = \frac{-18}{10} = -\frac{9}{5} \quad \text{and} \quad n = \frac{-19 - 1}{10} = \frac{-20}{10} = -2
\]
Equation 8: \(6n^2 - 17n = 14\)
Rewrite in standard form: \(6n^2 - 17n - 14 = 0\).
1. Identify coefficients: \(a = 6\), \(b = -17\), \(c = -14\).
2. Apply the quadratic formula:
\[
n = \frac{-(-17) \pm \sqrt{(-17)^2 - 4(6)(-14)}}{2(6)}
\]
3. Simplify inside the square root:
\[
n = \frac{17 \pm \sqrt{289 + 336}}{12} = \frac{17 \pm \sqrt{625}}{12} = \frac{17 \pm 25}{12}
\]
4. Solve for the two possible values of \(n\):
\[
n = \frac{17 + 25}{12} = \frac{42}{12} = \frac{7}{2} \quad \text{and} \quad n = \frac{17 - 25}{12} = \frac{-8}{12} = -\frac{2}{3}
\]
Final Answer:
\[
\boxed{
\begin{aligned}
&3g^2 - 17g - 6 = 0 \implies g = 6, -\frac{1}{3} \\
&4r^2 - 23r + 33 = 0 \implies r = 3, \frac{11}{4} \\
&24x^2 + 22x - 7 = 0 \implies x = \frac{1}{4}, -\frac{7}{6} \\
&2h^2 - 7h + 8 = 0 \implies h = \frac{7 \pm i\sqrt{15}}{4} \\
&20b^2 + 11b - 4 = 0 \implies b = \frac{1}{4}, -\frac{4}{5} \\
&12g^2 + 41g + 35 = 0 \implies g = -\frac{5}{3}, -\frac{7}{4} \\
&5n^2 + 19n + 18 = 0 \implies n = -\frac{9}{5}, -2 \\
&6n^2 - 17n - 14 = 0 \implies n = \frac{7}{2}, -\frac{2}{3}
\end{aligned}
}
\]
Parent Tip: Review the logic above to help your child master the concept of solving quadratic equations practice worksheet.