Question

x2-x-20=0 com a fórmula de Bhaskara

Answer 1

Eaew!!



Resolução!!!



x² - x - 20 = 0


a = 1
b = -1
c = -20


∆ = (-1)² - 4.1.(-20
∆ = 1 + 80
∆ = 81


x = -(-1) ± √81/2.1

x = 1 ± 9/2

x' = 1 - 9/2 = -8/2 = -4

x" = 1 + 9/2 = 10/2 = 5


S={ -4, 5 }