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Question

Let f(x)=x2 and g(x)=3x+4 . Then the value of (f+g)(x)(fg)(x)= when x = 1

A
43
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B
34
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C
43
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D
34
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Solution

The correct option is C 43
(f+g)(x)=f(x)+g(x)=x2+3x+4(fg)(x)=f(x)g(x)=x23x4(f+x)(x)(fg)(x)=x2+3x+4x23x4
At x = 1,
x2+3x+4x23x4=1+3+4134=86=43

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