Question

calcule
a) (-x+2x+4x)²-(-x+5x)²
b) (-5xy)•(-y)²+(-3y•) (-2x)​

Answer 1

a) (-x+2x+4x)²-(-x+5x)²

(5x)²-(4x)²-(4x)²

9x

b) (-5xy)•(-y)²+(-3y•) (-2x)

(-5xy)y²+6xy

-5xy²+6xy