n(n+1)(n-1)(n-2)=840

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Solution for n(n+1)(n-1)(n-2)=840 equation: 


Simplifying
n(n + 1)(n + -1)(n + -2) = 840

Reorder the terms:
n(1 + n)(n + -1)(n + -2) = 840

Reorder the terms:
n(1 + n)(-1 + n)(n + -2) = 840

Reorder the terms:
n(1 + n)(-1 + n)(-2 + n) = 840

Multiply (1 + n) * (-1 + n)
n(1(-1 + n) + n(-1 + n))(-2 + n) = 840
n((-1 * 1 + n * 1) + n(-1 + n))(-2 + n) = 840
n((-1 + 1n) + n(-1 + n))(-2 + n) = 840
n(-1 + 1n + (-1 * n + n * n))(-2 + n) = 840
n(-1 + 1n + (-1n + n2))(-2 + n) = 840

Combine like terms: 1n + -1n = 0
n(-1 + 0 + n2)(-2 + n) = 840
n(-1 + n2)(-2 + n) = 840

Multiply (-1 + n2) * (-2 + n)
n(-1(-2 + n) + n2(-2 + n)) = 840
n((-2 * -1 + n * -1) + n2(-2 + n)) = 840
n((2 + -1n) + n2(-2 + n)) = 840
n(2 + -1n + (-2 * n2 + n * n2)) = 840
n(2 + -1n + (-2n2 + n3)) = 840
n(2 + -1n + -2n2 + n3) = 840
(2 * n + -1n * n + -2n2 * n + n3 * n) = 840
(2n + -1n2 + -2n3 + n4) = 840

Solving
2n + -1n2 + -2n3 + n4 = 840

Solving for variable 'n'.

Reorder the terms:
-840 + 2n + -1n2 + -2n3 + n4 = 840 + -840

Combine like terms: 840 + -840 = 0
-840 + 2n + -1n2 + -2n3 + n4 = 0

The solution to this equation could not be determined.

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