Question

(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 + b^2 +2ab -a^2 - b^2 + 2ab  

= 2ab + 2ab  

= 4ab