Question

x ao quadrado + 4x - 12 = 0 ​

Answer 1

x² + 4x -12 = 0

a = 1

b = 4

c = -12

Δ = b² - 4 . a . c

Δ = 4² - 4 . 1 . (-12)

Δ = 16 + 48

Δ = 64

x = (-b +- √Δ) / 2 . a

x = (-4 +- √64) / 2 . 1

x = (-4 +- 8) / 2

x' = (-4 + 8)/ 2

x' = 4/2

x' = 2

x'' = (-4 - 8)/ 2

x''= -12/2

x'' = -6

Resposta: 2 e -6