What is the value of (a + b)² – (a – b) ²?

Correct option is D

Given:

​$$(a + b)^2 - (a - b)^2$$​​

Formula used:

​$$(a + b)^2 = a^2 + 2ab + b^2(a – b)^2 = a^2 – 2ab + b^2$$​​

Solution:

​$$(a + b)^2 - (a - b)^2 \\\ \\^=> (a^2 + 2ab + b^2) - (a^2 – 2ab + b^2)=> 4ab$$​​