an=(-1)n(n+3)

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Solution for an=(-1)n(n+3) equation: 


Simplifying
an = (-1) * n(n + 3)

Reorder the terms:
an = -1n(3 + n)
an = (3 * -1n + n * -1n)
an = (-3n + -1n2)

Solving
an = -3n + -1n2

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

Divide each side by 'n'.
a = -3 + -1n

Simplifying
a = -3 + -1n

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