Question

Сократите выражение:
9x(x+y)-x(x-y)=. . .

Answer 1

$9x(x + y) - x(x - y) = 9 {x}^{2} + 9xy - {x}^{2} + xy = 8 {x}^{2} + 10xy$

Answer 2

9x²+9xy-x²+xy=8x²+10xy