(a+b)²-2(a²-b²)+(a-b)²

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(a+b)²-2(a²-b²)+(a-b)²
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(a+b)²-2(a²-b²)+(a-b)²
(a+b)²-2(a²-b²)+(a-b)²

(a+b)²-2(a²-b²)+(a-b)²
(a+b)²-2(a²-b²)+(a-b)²
=a²+2ab+b²-2a²+2b²+a²-2ab+b²
=4b²