Question

-x2+2x+8=0 delta e baskara

Answer 1

Olá !



Resolução :


-X² + 2X + 8 = 0

A = -1 ; B = 2 ; C = 8


∆ = b² - 4 • a • c

∆ = 2² - 4 • (-1) • 8

∆ = 4 + 32

∆ = 36


X = -b ± √∆ / 2 • a

X = -2 ± √36 / 2 • (-1)

X = -2 ± 6 / (-2)

X' = -2 + 6 / (-2)

X' = 4 / (-2)

X' = -2


X'' = -2 - 6 / (-2)

X'' = -2 - 6 / (-2)

X'' = (-8) / (-2)

X" = 4



Resposta :



S = { -2 , 4 }