Question

-x²+2x+3=0 equeação do segundo grau

Answer 1

-x²+2x+3=0

a = -1

b = 2

c = 3

_______________

Δ = b² - 4 . a . c

Δ = 2² - 4 . (-1) . 3

Δ = 4 + 12

Δ = 16

_______________

x = ( -b +- √Δ) / 2 . a

x = ( -2 +- √16) / 2 . (-1)

x = ( -2 +- 4) / -2

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

x' = 2/-2

x' = -1

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

x'' = -6/-2

x'' = 3

Resposta: -1 e 3.

Answer 2

-x²+2x+3=0

a=-1 ; b=2 ; c=3

aplicando delta:

Δ=b²-4ac

Δ=2²-4(-1)(3)

Δ=4+4(3)

Δ=4+12=16

aplicando bhaskara:

x=-b±$\sqrt{16}$/2a

x=-2±4/-2

x'=-2+4/-2

x'=-2/2=-1

x''=-2-4/-2

x''=-6/2=-3