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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=7`

B

`a=6,b=7`

C

`a=7,b=6`

D

`a=7,b=8`

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