f(2a)=5n^2+2n

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Solution for f(2a)=5n^2+2n equation: 


Simplifying
f(2a) = 5n2 + 2n

Remove parenthesis around (2a)
f * 2a = 5n2 + 2n

Reorder the terms for easier multiplication:
2f * a = 5n2 + 2n

Multiply f * a
2af = 5n2 + 2n

Reorder the terms:
2af = 2n + 5n2

Solving
2af = 2n + 5n2

Solving for variable 'a'.

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

Divide each side by '2f'.
a = f-1n + 2.5f-1n2

Simplifying
a = f-1n + 2.5f-1n2

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