Question

Equaçao do 2 grau com formula de baskara x ao quadrado menos x menos dose igual a zero

Answer 1

x² - x - 12 = 0

Δ = 1 + 48 
Δ = 49

x = 1 +-√49/2
x = 1 +-7/2

x' = 1 +7/2
x' = 8/2 = 4

x'' = 1-7/2
x'' = -6/2 = -3                                  ok

Answer 2

x^2 - x - 12 = 0
a = 1 ; b = - 1 ; c = - 12
Δ = (-1)^2 - 4x1x(-12) = 1 - 4x(-12) = 1 + 48 = 49
√Δ = 7
x = - (- 1) +/- 7/2.1
x = 1 +/- 7/2

x' = 1 + 7/2 = 8/2 = 4
x'' = 1 - 7/2 = -6/2 = -3

S = {-3,4}