Question

Quanto é -X²+2X+3=O
me ajudem por favor

Answer 1

Δ = 4 + 12
Δ = 16
x = -2 +-√16/-2
x' = - 2 + 4 / -2
x' = 2/-2 = -1
x" = -2 - 4 / -2
x" = -6/-2 = 3             ok

Answer 2

- x²  + 2x + 3 = 0
Δ = 2² - 4 . ( -1 ) . 3
Δ = 16

x= -2 +/- √ 16 / -2
x' = -2 + 4 / -2
x' = +2/-2
x' -1

x'' = -2 -4 / -2
x'' = -6 / -2
x'' = +3

v= { -1,  +3}