Question

×2-×-5=0 usar a fórmula de bhaskara

Answer 1

x² - x - 5 = 0

a = 1; b = 1; c = - 5

∆ = b² - 4 . a . c

∆ = 1² - 4 . 1 . ( - 5 )

∆ = 1 + 20

∆ = 21

x = - ( + 1 ) ± √21 / 2

x' = 1 + √21 / 2

x" = 1 - √21 / 2

S = { 1 + √21 / 2; 1 - √21 / 2 }