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Question

If the roots of the equation x2+3x−18=0 are -6, 3 then the roots of the equation 2(x2+3x−18)=0 are

A
-6, 6
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B
-12, 6
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C
-6, 3
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D
3, 3
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Solution

The correct option is C -6, 3
The roots of a quadratic equation do not change when it is multiplied by a constant non-zero real number. So when the equation x2+3x18=0 is multiplied by 2, the roots still remain the same i.e. -6, 3.

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