Question

$factorise \: \: 15ab - 20bc + 12ac - 25 {b}^{2}$
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Answer 1

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Answer 2

15ab - 20bc + 12ac - 25b^2

taking common 3a and 5b

3a(5b + 4c) - 5b( 4c + 5b)

taking common 5b + 4c

(3a - 5b)(5b + 4c)