Question

factorise the following using appropriate identities :
25x square - 60xy + 4y square​

Answer 1

Question given:

Factorise 25x²-20xy+4y

solution:

25x²+4y-20xy

(5x)²+(2y)²- 2(5x)(2x)

(5x-2y)²

identity used:

(a-b)²=a²+b²-2ab

hence (5x-2y) (5x-2y) is correct Answer.