Question

4(x-y)^2-12(x-y)(x+y)+9(x+y)^2​

Answer 1

4(x²+y²-2xy) -{x²+xy-x/y -4²} +9(x²+y²+2xy)

4x²+4y²-8xy-12x²+12y²+9x²+9y²+18xy

13x²+13y²+10xy-12x²+12y²

=x²+25y²+10xy

Answer 2

Answer:

(x+5)^2

Step-by-step explanation:

=4(x^2+y^2-2xy)-12(x^2-y^2)+9(x^2+y^2+2xy)

=4x^2+4y^2-8xy-12x^2+12y^2+9x^2+9y^2+18xy

=13x^2-12x^2+13y^2+12y^2-8xy+18xy

=x^2+25y^2+10xy

=(x+5)^2