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4x2 - 36x + 81 = 4x2 - 18x - 18x +81 = 2x(2x - 9) - 9(2x - 9) = (2x - 9)2

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15y ago
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9y ago

(2x - 9)(2x - 9)

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Q: Factor 4x2 plus 81-36x
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