Question

6 x ao quadrado menos x menos 5 igual a zero

Answer 1

6x² - x - 5 = 0

Δ = b² – 4 . a . c
Δ = (-1)² - 4 . 6 . (-5)
Δ = 1 + 120
Δ = 121

 x = – b ± √Δ ÷ 2a
 x = - (-1) ± √121 ÷ 2 . 6
 x = 1 ± 11 ÷ 12

 x' = 1 + 11 ÷ 12 = 1
 x" = 1 - 11 ÷ 12 = - 0,83