Question

(2x+y).(2x-y)=2x²-y²
qual a resposta correta.

Answer 1

(2x+y).(2x-y)=2x²-y²
4x² - y²- 2x² + y² = 0
2x² = 0
x = 0

Answer 2

$(2x+y)(2x-y)=2x^2-y^2\\4x^2-y^2=2x^2-y^2$