Question

-x²+9x+18=0 e 2x²+4x+27=0 me ajudem nessas duas

Answer 1

-x²+9x+18=0

-9 +-√9²-4.(-1).18 / 2.(-1)

-9+-√81+69 / -2

-9+12,36 / -2 = -1,68'

-9-12,36 / -2 = 10,68 ''

2x²+4x+27=0

-4+-√4²-4.2.27 / 2.2

-4+-√16-216

-4+-14,14 / 4

-4+14,14 / 4 = 2,53'

-4-14,14 / 4 = -4,53"