Question

X2-4x-5=0 me ajudem
Em delta e bastará

Answer 1

X² -4x -5=0
Fórmula de Bhaskara
-b+-√b²-4ac/2a
Δ=b²-4ac
Δ=(-4)² -4(1(-5)
Δ=16+20
Δ=36

X=+4 +-√36/2
X=+4+-6/2
X,=+4+6/2
X,=+10/2
X,=+5

X,,=+4-6/2

X,,=-2/2

X,,=-1

S={ -1, +5}