If x^(4)+2x^(3)+ax^(2)+bx+9 is a perfec...

If `x^(4)+2x^(3)+ax^(2)+bx+9` is a perfect square, where a and b are positive real numbers, then the value of a and b are:

A

a=5, b=6

B

a=6, b=7

C

a=7, b=6

D

a=7, b=8

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The correct Answer is:

C

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