Question

Factorise a-b-4a square+ 4b square​

Answer 1

$a - b - 4 {a}^{2} + 4 {b}^{2}$

$= 1(a - b) - 4( {a}^{2} - {b}^{2} )$

$= 1(a - b) - 4(a + b)(a - b)$

$= (a - b)(1 - 4(a + b))$

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