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If the equation x ^(2) +ax+12 =9, x ^(2)...

If the equation `x ^(2) +ax+12 =9, x ^(2) +bx +15 =0 and x^(2) + (a+b) x +36=0` have a common positive root, then `b+2a` equal to.

A

`(-6,-8)`

B

`(-7,-8)`

C

`(-6,-7)`

D

`(-7,-9)`

Text Solution

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The correct Answer is:
B
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