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 If f(x) = x3 + 4x and g(x) = -2x + 1, then f(g(3))= ?

A)-195

B)-145

C)-77

D)-5

E)39

 Oct 4, 2018
 #1
avatar+23660 
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g(3) = -2(3)+1 = -5    now substitute this in to the  f(x) function

 

f(-5) = -5^3 + 4(-5) = -125 - 20 = -145      "B"   

 Oct 4, 2018

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