(a-b)(a+b)²-(a+b)(a-b)²+2b(a²+b²)
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![(a-b)(a+b)²-(a+b)(a-b)²+2b(a²+b²)](/uploads/image/z/1673385-33-5.jpg?t=%28a-b%29%28a%2Bb%29%26%23178%3B-%28a%2Bb%29%28a-b%29%26%23178%3B%2B2b%28a%26%23178%3B%2Bb%26%23178%3B%29)
(a-b)(a+b)²-(a+b)(a-b)²+2b(a²+b²)
(a-b)(a+b)²-(a+b)(a-b)²+2b(a²+b²)
(a-b)(a+b)²-(a+b)(a-b)²+2b(a²+b²)
(a-b)(a+b)²-(a+b)(a-b)²+2b(a²+b²)
=(a+b)(a-b)[(a+b)-(a-b)]+2b(a²+b²)
=2b(a²-b²)+2b(a²+b²)
=2b[(a²-b²)+(a²+b²)]
=4a²b