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Question

Find f o g when f(x)=2x+1 and
g(x)=x2−2.

A
2x2+3
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B
2x23
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C
2x23
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D
2x2+3
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Solution

The correct option is B 2x23
Given:
f(x)=2x+1 and g(x)=x22
fog(x)=f(g(x)) =f(x22) =2(x22)+1 =2(x2)3

fog(x)=2x23

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