Question

Factorise is25 (x-y)²-4 (x+y)^2

​

Answer 1

Answer:

25(x-y)^2 -4(x+y)^2

Explanation:

we have to first make the sum in the form of

a^2 - B^2 = (a - b)(a+b)

so therefore,

{5(x-y)}^2 - {2(x+y)^2}     [ this is in form of a^2 - b^2 ]

= {5(x-y) + 2(x+y)}{5(x-y) - 2(x+y)}

={5x-5y+2x+2y}{5x-5y-2x-2y}

={7x-3y}{3x-7y}

THIS IS YOUR ANSWER :) :)