Question

5x2 - 3x - 2 = 0

qual o valor de x ?

Answer 1

Resposta:

$5x^{2} - 3x - 2 = 0\\\\a = 5 ; b = -3 ; c = -2\\\\\\delta = (-3)^{2} - (4 . 5 . -2)\\\\delta = 9 + 40\\\\delta = 49\\\\x = \frac{-(-3) +/- \sqrt{49} }{2 . 5}\\\\x = \frac{3 +/- 7}{10}\\\\x1 = \frac{3 + 7}{10} = 1\\\\x2 = \frac{3 - 7}{10} = \frac{-4}{10} = \frac{-2}{5}$