Question

1. Expand

(1) (a +2)(a - 1) ?​

Answer 1

(a+2)(a−1)

= a(a−1)+2(a−1)

=a2−a+2a−2

=a2+(−a+2a)

=2(Combiningliketerms)

=a2+a−2

Hence, (a+2)(a−1)=a2+a−2.