Q. 9

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



A.

B.

C.

D.

Answer :


Completing the square


x2 +4x+8 = x2+4x+8 (+4-4)


=x2+4x+4+4


=(x+2)2 +22



Let x+2=t


dx=dt



We know,



put t=x+2


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