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Factorise 4(x-y)^2 + 28(x-y) - 72 |
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Answer» Answer: 4x^2 + 4y^2 + 28x -28y -8xy-72 = 0 =>4 ( x^2 + y^2 + 7x - 7y - 2xy - 18 ) = 0 => x^2 + y^2 + 7 (x-y) - 2xy = 18
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