Question

-2x elevado a 2 +5x-2=0

Answer 1

- 2x² + 5x - 2 = 0

∆ = 5² - 4 × (- 2) × (- 2)
∆ = 25 - 16
∆ = 9

x = (- 5 ± √9) / 2 × (- 2)
x = (- 5 ± 3) / - 4

x' = (- 5 + 3) / - 4
x' = - 2 / - 4
x' = ½ ou 0,5

x" = (- 5 - 3) / - 4
x" = - 8 / - 4
x" = 2

S = {½, 2}