Question

a) X^2(x-1)-x(x^2+×-1)

b) x(x+1)+(1-x)(1+x)-x(x+3)

Answer 1

$a) {x}^{2} (x - 1) - x( {x}^{2} + x - 1) = {x}^{3} - {x}^{2} - {x}^{3} - {x}^{2} + x = x - 2 {x}^{2}$
$b) {x}^{2} + x + 1 - {x}^{2} - {x}^{2} - 3x = - {x}^{2} - 2x + 1$