Question

factorise a² - 5b² - 4ab​

Answer 1

Answer:

a²-4ab+4b²

=(a)²-2.a.2b+(2b)²

=(a-2b)²

=(a-2b(a-2b)

$hope \: it \: help$

Answer 2

a

2

−1)(b

2

−1)+4ab

=a

2

b

2

−a

2

−b

2

+1+2ab+2ab

=(ab)

2

+2(ab)(1)+1

2

−(a

2

−2ab+b

2

)

=(ab+1)

2

−(a−b)

2

=(ab+1+a−b)(ab+1−a+b)