Question

1)x(2x-9)²-2x(15+x) ²
2)0,x(xy-2)²+1,2(xy-1)²
3)(x+2)²-(x-3)(x+3)
4)(7a-5b)(7a+5b)-(4a+7b)²

Answer 1

1) x(4x^2-36x+81-450-60x-2x^2)
x(2x^2-96x-369)
3) x^2+4x+4-(x^2-9)
X^2+4x+4-x^2+9
4x+13
4) 49a^2-25b^2-16a^2-56ab-49b^2
33a^2-74b^2-56ab