Question

factories 2(ab + cd) + a2 + b2 - c2 - d2​

Answer 1

Answer:

$2\left(ab+cd\right)+a^2+b^2-c^2-d^2\\= 2ab+2cd+a^2+b^2-c^2-d^2\\= 2\left(ab+cd\right) + (a+b-c-d)^{2}$

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