f(n)=20+(-10)(n-1)

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Solution for f(n)=20+(-10)(n-1) equation: 


Simplifying
f(n) = 20 + (-10)(n + -1)

Multiply f * n
fn = 20 + (-10)(n + -1)

Reorder the terms:
fn = 20 + -10(-1 + n)
fn = 20 + (-1 * -10 + n * -10)
fn = 20 + (10 + -10n)

Combine like terms: 20 + 10 = 30
fn = 30 + -10n

Solving
fn = 30 + -10n

Solving for variable 'f'.

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

Divide each side by 'n'.
f = 30n-1 + -10

Simplifying
f = 30n-1 + -10

Reorder the terms:
f = -10 + 30n-1

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