Question

If f(x) = 3x - 15, what is f(4)?
A. 3
B. -3
c. 12
D. -8

Answer 1

B. -3

Explanation:

f(x) = 3x - 15

f(4) means x=4, so you want to plug 4 into the equation.

f(4) = 3(4) - 15

f(4) = 12 - 15

f(4) = -3

Answer 2

B

Explanation:

f(4) has the same meaning (for this question ) as x = 4

Let x = 4

f(4) = 3*4 - 15

f(4) = 12 - 15

f(4) = - 3

B