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Question

Find the value of the polynomial x2+2x+5 when, x=a

A
a22a2
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B
a3+2a+4
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C
a2+a+5
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D
a2+2a+5
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Solution

The correct option is D a2+2a+5
Let f(x)=x2+2x+5
When x=a,
f(a)=a2+2(a)+5
=a2+2a+5

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