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Question

Find (f+g)(1) when f(x)=x+6 and g(x)=x3.

A
5
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B
1
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C
11
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D
7
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Solution

The correct option is B 5
Given, f(x)=x+6 and g(x)=x3
We know (f+g)(1) =f(1)+g(1) .....(i)
So, f(1)=1+6=7
and g(1)=13=2
On substituting this value in equation (i), we get
(f+g)(1)=72=5

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