Question

Factorise
50a²- 140 ab +98b²​

Answer 1

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Answer 2

2(25a^2-70ab+49b^2)
= 2[(5a)^2+(7b)^2-2(5a)(7b)]
= 2(5a-7b)^2
= 2(5a-7b)(5a-7b)