Question

factorise
$49a ^{2} + 70ab + 25 {b}^{2}$
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Answer 1

Answer:

$49 {a}^{2} + 70ab + 25 {b}^{2} =$

$(7a) {}^{2} + 2 \times 7a \times 5b + (5b) {}^{2} =$

$(7a + 5b) {}^{2}$