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480 * (n+1)(n-2) = 480(n-2)
480 *[n²-2n+n-2]=480n-960
480n²-480n-960=480n-960
480n²-960n=0 |480
n²-2n=0 a=1 b=2 c=o
Δ≡b² -4ax
Δ≡4 - 4 *1*0
Δ≡4
√Δ=2
x₁=-b-√Δ / 2a
x₁=-2-2 / 2
x₁= -2
x₂=-b+√Δ / 2a
x₂=-2+2 / 2
x₂=0