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Question

If x = 1 is a common root of the equation x2 + ax - 3 = 0 and bx2 - 7x + 2 = 0 then ab =


A

10

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B

-3

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C

7

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D

6

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Solution

The correct option is A

10


x = 1 is a common root of the equation x2 + ax - 3 = 0 and bx2 - 7x + 2 = 0
12 + a.1 - 3 =0 , hence a = 2

b.12 - 7.1 + 2 =0 , hence b = 5

ab = 2.5 = 10


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