Question

Treze menos dois x menos quinze x ao quadrado igual a 0

Answer 1

13 -2x -15x^2 = 0
-15x^2 -2x +13 = 0 a= -15 b= -2 c=13
Delta = 2^2 -4*-155*13 D = 4 + 60*13 D = 4 +780 D = 784 D = 28
x' = -(-2) +28/-30 x' = 2 + 20/-30 x' = 30/-30 x' = -1
x'' = 2 -28/-30 x'' = -26/-30 x'' = 0,8667

S = {-1, +0,8667}