Q. 9

# Mark (√) against the correct answer in each of the following:

A.

B.

C.

D.

Answer :

Completing the square

x^{2} +4x+8 = x^{2}+4x+8 (+4-4)

=x^{2}+4x+4+4

=(x+2)^{2} +2^{2}

Let x+2=t

dx=dt

We know,

put t=x+2

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