an=20+(n-1)2

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Solution for an=20+(n-1)2 equation: 


Simplifying
an = 20 + (n + -1) * 2

Reorder the terms:
an = 20 + (-1 + n) * 2

Reorder the terms for easier multiplication:
an = 20 + 2(-1 + n)
an = 20 + (-1 * 2 + n * 2)
an = 20 + (-2 + 2n)

Combine like terms: 20 + -2 = 18
an = 18 + 2n

Solving
an = 18 + 2n

Solving for variable 'a'.

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

Divide each side by 'n'.
a = 18n-1 + 2

Simplifying
a = 18n-1 + 2

Reorder the terms:
a = 2 + 18n-1

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