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9

Set 3: Function Notation (Beginner)

Explanation

Answer: D

PROBLEM

If f(x) = 5x + 6, find f(3).

If f(x) = 5x + 6, find f(3).

A.

23

B.

18

C.

24

D.

21

✓ Correct

Detailed Explanation

Choice D is the best answer. f(3) = 5(3) + 6 = 15 + 6 = 21

Why others are wrong:
A: 23 is incorrect because it does not satisfy the equation.
B: 18 is incorrect because it does not satisfy the equation.
C: 24 is incorrect because it does not satisfy the equation.
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