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If equations x^2+a x+12=0. x^2+b x+15=0a...

If equations `x^2+a x+12=0. x^2+b x+15=0a n dx^2+(a+b)x+36=0,` have a common positive root, then find the values of `aa n dbdot`

A

`(-7, -8)`

B

(-8,-7)

C

(7,8)

D

(8,7)

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A
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