Question

factorise 9(7x-3y)²-4(5x+4y)²​

Answer 1

Answer:

Multiply :

9(7x-3y)^2-4(5x+4y)^2

Assume that 7x-3y =x

5x+4y=y

9x^2-4y^2

(3x)^2- (2y)^2

(3x+2y)×(3x-2y)_____(1)

Than substitute the values x and y in the equation(1)

hence, you will the factorised form