Factorise a^2+4ab +4b^2
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a²4ab+4b²
a²+2ab+2ab+4b²
a(a+2b)+2b(a+2b)
(a+2b)(a+2b)
(a+2b)²
a²+2ab+2ab+4b²
a(a+2b)+2b(a+2b)
(a+2b)(a+2b)
(a+2b)²
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