x²-2x-48=0
Δ=(-2)²-4·1·(-48)
Δ=4-(-192)
Δ=4+192
Δ=196
√Δ=√196=14
x₁=(2-14)/(2·1)=-12/2=-6
x₂=(2+14)/(2·1)=16/2=8
