Question

If f(x) = −4x + 1, find f(−5).

A.20
B.-19
C.21
D.-8

Answer 1

I Got C but is that correct?

Answer 2

f(-5) means "find f(x) when x = -5"


f(x) = −4x + 1

f(-5) = −4(-5) + 1 ... replace all copies of 'x' with '-5' (since x = -5)

f(-5) = 20 + 1

f(-5) = 21

so you are 100% correct

Answer 3

basically its pretty much just saying fill in for x which is (-5)
-4(-5)+1
20+1 = 21
C is the correct answer.

Answer 4

@jim_thompson5910 & @genson0 thanks

Answer 5

yw

Answer 6

You're welcome :) any time.