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Grade 8 Algebra: Evaluating Functions
Name: ______________________
Date: ____________
Score: ____ / 8
Level 1
Whole-number inputs
1.
Evaluate:
f
(
x
)
=
x
+
5
;
f
(
3
)
f(x) = x + 5;\ f(3)
f
(
x
)
=
x
+
5
;
f
(
3
)
2.
Evaluate:
f
(
x
)
=
2
x
;
f
(
6
)
f(x) = 2x;\ f(6)
f
(
x
)
=
2
x
;
f
(
6
)
3.
Evaluate:
f
(
x
)
=
x
−
4
;
f
(
10
)
f(x) = x - 4;\ f(10)
f
(
x
)
=
x
−
4
;
f
(
10
)
4.
Evaluate:
f
(
x
)
=
3
x
+
1
;
f
(
2
)
f(x) = 3x + 1;\ f(2)
f
(
x
)
=
3
x
+
1
;
f
(
2
)
5.
Evaluate:
f
(
x
)
=
5
x
−
3
;
f
(
4
)
f(x) = 5x - 3;\ f(4)
f
(
x
)
=
5
x
−
3
;
f
(
4
)
6.
Evaluate:
f
(
x
)
=
10
−
x
;
f
(
7
)
f(x) = 10 - x;\ f(7)
f
(
x
)
=
10
−
x
;
f
(
7
)
7.
Evaluate:
f
(
x
)
=
4
x
+
2
;
f
(
0
)
f(x) = 4x + 2;\ f(0)
f
(
x
)
=
4
x
+
2
;
f
(
0
)
8.
Evaluate:
f
(
x
)
=
x
2
+
1
;
f
(
8
)
f(x) = \tfrac{x}{2} + 1;\ f(8)
f
(
x
)
=
2
x
+
1
;
f
(
8
)
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