Question

Simplify (i) (x+y)(x2-xy+y2)

(ii)(a+b+c)(a+b-c)​

Answer 1

Answer:

1)x(x2-xy+y2)+y(x2-xy+y2)

=x3-x2y+xy2+x2y-xy2+y3

=x3+y3

2)a(a+b-c)+b(a+b-c)+c(a+b-c)

=a2+ab-ac+ab+b2-bc+ac+bc-c2

=a2+b2-c2+2ab