Question

$(x - y {)}^{2} - 7(x {}^{2} - y { }^{2}) + 12(x + y) {}^{2}$
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Answer 1

Answer:

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Step-by-step explanation:

(x-y)²-7(x²-y²)+12(x+y)²

=x²+y²-2xy-7x²+7y²+12(x²+y²+2xy)

=-6x²+8y²-2xy+12x²+12y²+24xy

=6x²+20y²+20xy