Question

simplify the following using ( a-b)^2
1) (p-2q) (p+2q)

Answer 1

Answer = p^2-4q^2

Explaination =( a-b) ^2

(a-b) ( a+b)

So,

(p-2q ) ( p-2q)

p^2+2pq-2pq -4q^2

p^2-4q^2