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eviant:
Let f(x) = -2x - 7 and g(x) = -4x + 6. Find (f*g)(-5)
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eviant:
@mhchen
mhchen:
I think (f*g)(-5) = f(-5)*g(-5). so first find f(-5)
eviant:
10x+35
mhchen:
uh well f(-5) = -2(-5) - 7 = 10 - 7 = 3
mhchen:
I'm not sure how you got 10x + 35, Did you see what I did? Try to find g(-5) now,
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eviant:
-4(-5)+6 20+6 26?
mhchen:
Yup so all you have to do now is multiply f(-5) and g(-5) together 3 * 26
eviant:
78?
mhchen:
ye
eviant:
3 –6 26 –59
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mhchen:
oh are those the options?
eviant:
^^those are the choices
mhchen:
HMMMmmmmm
mhchen:
okay I'm gonna assume (f*g)(x) is (fog)(x) or f(g(x)) a composite function
mhchen:
basically first you find g(-5) which you already did. It was 26 Then you plug 26 into f(x)
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mhchen:
Can you find f(26)?
eviant:
@mhchen -2(26)-7=-59?
mhchen:
yep
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