Question

quanto vale x?

10$x^{2}$ - 10x - 900 = 0

Answer 1

10x²-10x-900=0 simplificar por 10

X²-x-90

Δ= 1²+4x90

Δ=1 +360

Δ=361

X=+1+-19/2

X,=+1+19/2

X,=20/2=10

X,,=+1-19/2

X,,=-18/2

X,,= -9