Here are the step-by-step solutions for the problems shown on the worksheets.
Worksheet A (Left Side)
Functions given:
* $f(x) = 3x + 12$
* $g(x) = x^2 - 1$
* $h(x) = -x + 6$
* $j(x) = -4x^2$
* $k(x) = x^2 + 5x + 1$
Solutions:
1.
Find $f(3)$:
Substitute $3$ for $x$ in $f(x)$.
$f(3) = 3(3) + 12 = 9 + 12 = \mathbf{21}$
2.
Find $j(-1)$:
Substitute $-1$ for $x$ in $j(x)$.
$j(-1) = -4(-1)^2 = -4(1) = \mathbf{-4}$
3.
Find $g(7)$:
Substitute $7$ for $x$ in $g(x)$.
$g(7) = (7)^2 - 1 = 49 - 1 = \mathbf{48}$
9.
Find $f(-2)$:
Substitute $-2$ for $x$ in $f(x)$.
$f(-2) = 3(-2) + 12 = -6 + 12 = \mathbf{6}$
10.
Find $g(5)$:
Substitute $5$ for $x$ in $g(x)$.
$g(5) = (5)^2 - 1 = 25 - 1 = \mathbf{24}$
11.
Find $h(14)$:
Substitute $14$ for $x$ in $h(x)$.
$h(14) = -(14) + 6 = -14 + 6 = \mathbf{-8}$
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Worksheet B (Right Side)
Functions given:
* $f(x) = x^2 + 3$
* $g(x) = -2x^2$
* $h(x) = 4x - 15$
* $j(x) = x^2 + 3x - 4$
* $k(x) = -x + 4$
Solutions:
1.
Find $h(3)$:
Substitute $3$ for $x$ in $h(x)$.
$h(3) = 4(3) - 15 = 12 - 15 = \mathbf{-3}$
2.
Find $g(3)$:
Substitute $3$ for $x$ in $g(x)$.
$g(3) = -2(3)^2 = -2(9) = \mathbf{-18}$
3.
Find $f(4)$:
Substitute $4$ for $x$ in $f(x)$.
$f(4) = (4)^2 + 3 = 16 + 3 = \mathbf{19}$
9.
Find $h(6)$:
Substitute $6$ for $x$ in $h(x)$.
$h(6) = 4(6) - 15 = 24 - 15 = \mathbf{9}$
10.
Find $g(4)$:
Substitute $4$ for $x$ in $g(x)$.
$g(4) = -2(4)^2 = -2(16) = \mathbf{-32}$
11.
Find $f(-5)$:
Substitute $-5$ for $x$ in $f(x)$.
$f(-5) = (-5)^2 + 3 = 25 + 3 = \mathbf{28}$
12.
Find $h(-4)$:
Substitute $-4$ for $x$ in $h(x)$.
$h(-4) = 4(-4) - 15 = -16 - 15 = \mathbf{-31}$
13.
Find $k(11)$:
Substitute $11$ for $x$ in $k(x)$.
$k(11) = -(11) + 4 = -11 + 4 = \mathbf{-7}$
14.
Find $f(6)$:
Substitute $6$ for $x$ in $f(x)$.
$f(6) = (6)^2 + 3 = 36 + 3 = \mathbf{39}$
15.
Find $j(-3)$:
Substitute $-3$ for $x$ in $j(x)$.
$j(-3) = (-3)^2 + 3(-3) - 4$
$= 9 - 9 - 4$
$= 0 - 4 = \mathbf{-4}$
16.
Find $k(12)$:
Substitute $12$ for $x$ in $k(x)$.
$k(12) = -(12) + 4 = -12 + 4 = \mathbf{-8}$
Final Answer:
Worksheet A Answers:
1. 21
2. -4
3. 48
9. 6
10. 24
11. -8
Worksheet B Answers:
1. -3
2. -18
3. 19
9. 9
10. -32
11. 28
12. -31
13. -7
14. 39
15. -4
16. -8
Parent Tip: Review the logic above to help your child master the concept of function notation worksheet.