What is the value of $(a+b)^2-(a-b)^2$ ?
Answer & explanation
Correct answer: option 4
(a+b)2−(a−b)2
= (a2+2ab+b2)−(a2−2ab+b2)
= a2+2ab+b2−a2+2ab−b2 = 4ab.
What is the value of $(a+b)^2-(a-b)^2$ ?
Correct answer: option 4
(a+b)2−(a−b)2
= (a2+2ab+b2)−(a2−2ab+b2)
= a2+2ab+b2−a2+2ab−b2 = 4ab.