Question

2 y ao quadrado menos y sobre 3 igual a zero

Answer 1

2y^2 - y/3 = 0
y(2y - 1/3) = 0

i) y = 0
ii) 2y - 1/3 = 0
2y = 1/3
y = 1/6

S = { 0, 1/6 }