Question

Factorise (a+2b)^2-a^2

Answer 1

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Answer 2

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$(a + 2b) ^{2} - a ^{2} \\ \\ = (a) ^{2} + (2b) ^{2} + 2 \times a \times 2b - a ^{2} \\ \\ = a ^{2} + 4b ^{2} + 4ab - a ^{2} \\ \\ = 4b ^{2} + 4ab \\ \\ = 4b(b + a)$



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