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Question

9q2 - 18q + 9 =


A

(3q + 3)(3q + 3)

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B

(3q + 3)

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C

(3q - 3)(3q + 3)

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D

(3q - 3)(3q - 3)

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Solution

The correct option is D

(3q - 3)(3q - 3)


9q2 - 18q + 9 = (3q)2 - 2(3q)(3) + 32 = (3q - 3)2

= (3q - 3)(3q - 3)


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