Question

Expand (a+b)²,(a-b)²,(x+a),(x+b),a²-b²​

Answer 1

(a+b)^2=(a+b) (a+b)=(a+b)^2

(a-b)^2=(a-b) (a-b)=(a-b)^2

a^2-b^2=(a-b)×(a+b)=a^2-b^2