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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.

Worksheet with eight quadratic equations to solve using the quadratic formula.

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Show Answer Key & Explanations Step-by-step solution for: Quadratic Formula Worksheets (printable, online, answers, examples)
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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.

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.
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