Question

Factorise 4a2-20ab+25b2

Answer 1

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$4 {a}^{2} + 20ab + 25 {b}^{2} \\ {(2a)}^{2} + {(5b)}^{2} + 2 \times 2 \times 5ab \\ it \: is \: identity \: of \: {(a + b)}^{2} \\ so \: \\ {(2a + 5b)}^{2} is \: ans.$