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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


Your Answer
A
43 
Your Answer
B
34 
Correct Answer
C
43 
Your Answer
D
34 

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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