Question

$x^{2} + 5x - 14 = 0$
Resolução por favor.​

Answer 1

x² + 5x - 14 = 0

a = 1

b = 5

c = -14

∆ = b² - 4a.c

∆ = (5)² - 4.1.(-14)

∆ = 25 + 56

∆ = 81

X = -b ± √∆ / 2.a

X = -5 ± √81 / 2.1

X = -5 ± 9 / 2

X' = -5 + 9 / 2

X' = 4 / 2

X' = 2

X" = -5 - 9 / 2

X" = -14 / 2

X = -7

S = {x € R / x = 2 ou x = -7}