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Question

x2 - 2x + 3 - A = -3x2 + 4x - 9, then A =


A

-4x2 - 6x + 12

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B

4x2 + 6x - 12

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C

4x2 - 6x + 12

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D

4x2 + 6x + 12

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Solution

The correct option is C

4x2 - 6x + 12


x2 - 2x + 3 - A = -3x2 + 4x - 9

Thus, -A = -3x2 + 4x - 9 - (x2 - 2x + 3)

-A = -3x2 + 4x - 9 - x2 + 2x - 3

-A = -4x2 + 6x - 12

Hence, A = 4x2 - 6x + 12


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