Question

(a+b)elevado a 2-(a-b)elevado a 2

Answer 1

(a)²+2.a.b+(b)² - (a)²-2.a.b+(b)²
a²+2ab+b² - a²-2ab+b²
2b²
Espero que tenha entendido

Answer 2

= (a + b)^2 - (a - b)^2
= a^2 + 2ab + b^2 - [a^2 - 2ab + b^2]
= a^2 + 2ab + b^2 - a^2 + 2ab - b^2
= a^2 - a^2 + b^2 - b^2 + 2ab + 2ab
= 4ab