1. x2 6x 9 - 9y2 2. 3(x-y) - 5x( y - x)

Question

1. x^2 + 6x + 9 - 9y^2 2. 3(x-y) - 5x( y - x)

ankim · Answer

Gửi bn

tonhu12 · Answer

1.   x^2+6x+9-9y^2   = x^2+2.x.3+3^2-(3y)^2   = (x+3)^2-(3y)^2   = (x+3+3y)(x+3-3y)   2.   3(x-y)-5x(y-x)   = 3(x-y)+5x(x-y)   = (x-y)(3+5x)   $#<33$

1. x^2 + 6x + 9 – 9y^2 2. 3(x-y) – 5x( y – x)