Question

(a+1)(a-1)= (x-15)(x-1)= (4+x)(x-8)= (3a-2b)(a+b)=

Answer 1

(a+1)(a-1)= a²-1

(x-15)(x-1)=x²-x-15x+15=x²-16x+15

(4+x)(x-8)=4x-32+x²-8x=x²-4x-32

(3a-2b)(a+b)=3a²+3ab-2ab-2b²=3a²-2b²+ab