a(n)=9+(n-1)4

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Solution for a(n)=9+(n-1)4 equation: 


Simplifying
a(n) = 9 + (n + -1) * 4

Multiply a * n
an = 9 + (n + -1) * 4

Reorder the terms:
an = 9 + (-1 + n) * 4

Reorder the terms for easier multiplication:
an = 9 + 4(-1 + n)
an = 9 + (-1 * 4 + n * 4)
an = 9 + (-4 + 4n)

Combine like terms: 9 + -4 = 5
an = 5 + 4n

Solving
an = 5 + 4n

Solving for variable 'a'.

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

Divide each side by 'n'.
a = 5n-1 + 4

Simplifying
a = 5n-1 + 4

Reorder the terms:
a = 4 + 5n-1

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