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Grade 8 Algebra: Evaluating Functions
Name: ______________________
Date: ____________
Score: ____ / 8
Level 3
Solving and combining
1.
Find
x
{x}
x
:
f
(
x
)
=
2
x
+
3
;
f
(
x
)
=
11
f(x) = 2x + 3;\ f(x) = 11
f
(
x
)
=
2
x
+
3
;
f
(
x
)
=
11
2.
Find
x
{x}
x
:
f
(
x
)
=
5
x
−
7
;
f
(
x
)
=
−
2
f(x) = 5x - 7;\ f(x) = -2
f
(
x
)
=
5
x
−
7
;
f
(
x
)
=
−
2
3.
Find
x
{x}
x
:
g
(
x
)
=
−
4
x
+
6
;
g
(
x
)
=
18
g(x) = -4x + 6;\ g(x) = 18
g
(
x
)
=
−
4
x
+
6
;
g
(
x
)
=
18
4.
Evaluate:
f
(
x
)
=
3
x
−
1
;
f
(
2
)
+
f
(
−
1
)
f(x) = 3x - 1;\ f(2) + f(-1)
f
(
x
)
=
3
x
−
1
;
f
(
2
)
+
f
(
−
1
)
5.
Evaluate:
f
(
x
)
=
x
2
,
g
(
x
)
=
2
x
+
1
;
f
(
3
)
−
g
(
3
)
f(x) = x^2,\ g(x) = 2x + 1;\ f(3) - g(3)
f
(
x
)
=
x
2
,
g
(
x
)
=
2
x
+
1
;
f
(
3
)
−
g
(
3
)
6.
Find
x
{x}
x
:
f
(
x
)
=
x
3
+
4
;
f
(
x
)
=
6
f(x) = \tfrac{x}{3} + 4;\ f(x) = 6
f
(
x
)
=
3
x
+
4
;
f
(
x
)
=
6
7.
Evaluate:
f
(
x
)
=
2
x
−
1
;
f
(
f
(
2
)
)
f(x) = 2x - 1;\ f(f(2))
f
(
x
)
=
2
x
−
1
;
f
(
f
(
2
))
8.
Find
x
{x}
x
:
f
(
x
)
=
−
2
x
+
9
;
f
(
x
)
=
x
f(x) = -2x + 9;\ f(x) = x
f
(
x
)
=
−
2
x
+
9
;
f
(
x
)
=
x
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