Question

28. Simplify: (a + b)2 – (a - b)2​

Answer 1

(a+b)^2-(a-b)^2

a^2+b^2+2ab-a^2+b^2-2ab

+a^2 -a^2 get cancel

+2ab -2ab get cancel

then,

b^2+b^2=2b^2