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6

Set 1: Function Notation (Intermediate)

Explanation

Answer: A

PROBLEM

If f(x) = 4x + 1, find f(9).

If f(x) = 4x + 1, find f(9).

A.

37

✓ Correct
B.

38

C.

39

D.

35

Detailed Explanation

Choice A is the best answer. f(9) = 4(9) + 1 = 36 + 1 = 37

Why others are wrong:
B: 38 is incorrect because it does not satisfy the equation.
C: 39 is incorrect because it does not satisfy the equation.
D: 35 is incorrect because it does not satisfy the equation.
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