Question

разложить на множители 16(x-y)^2-25(x+y)^2

Answer 1

= 16 * ( X^2 - 2XY + Y^2) - 25 * ( X^2 + 2XY + Y^2 ) =
= 16X^2 - 32XY + 16Y^2 - 25X^2 - 50XY - 25Y^2 =
= - 9X^2 - 82XY - 9Y^2 = - 9 * ( X^2 + 9XY + Y^2 ) 

Answer 2

16(х^2-2xy+y^2)-25(х^2+2xy+y^2);
16х^2-32xy+16^2-25х^2+50xy+25y^2)