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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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