Question

Let f(x) = -2x - 7 and g(x) = -4x + 6. Find (f*g)(-5)

Answer 1

@mhchen

Answer 2

I think (f*g)(-5) = f(-5)*g(-5).

so first find f(-5)

Answer 3

10x+35

Answer 4

uh well
f(-5) = -2(-5) - 7
= 10 - 7
= 3

Answer 5

I'm not sure how you got 10x + 35, Did you see what I did?

Try to find g(-5) now,

Answer 6

-4(-5)+6
20+6
26?

Answer 7

Yup

so all you have to do now is multiply f(-5) and g(-5) together

3 * 26

Answer 8

78?

Answer 9

ye

Answer 10

3


–6


26


–59

Answer 11

oh are those the options?

Answer 12

^^those are the choices

Answer 13

HMMMmmmmm

Answer 14

okay I'm gonna assume (f*g)(x) is (fog)(x) or f(g(x))

a composite function

Answer 15

basically first you find g(-5) which you already did. It was 26

Then you plug 26 into f(x)

Answer 16

Can you find f(26)?

Answer 17

@mhchen -2(26)-7=-59?

Answer 18

yep