how can we solve the problem 4(2a+b)(2a+b)-(a-b)(a-b)
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4(4a2+4ab+ b2)-(a2-2ab+b 2)
16à^2+16ab+4b2-a2+2 ab-b2
15 a2+18ab+3b2
= 3(5a2+6ab+b2)
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