an=an-1+an-2

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Solution for an=an-1+an-2 equation:


Simplifying
an = an + -1 + an + -2

Reorder the terms:
an = -1 + -2 + an + an

Combine like terms: -1 + -2 = -3
an = -3 + an + an

Combine like terms: an + an = 2an
an = -3 + 2an

Solving
an = -3 + 2an

Solving for variable 'a'.

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

Add '-2an' to each side of the equation.
an + -2an = -3 + 2an + -2an

Combine like terms: an + -2an = -1an
-1an = -3 + 2an + -2an

Combine like terms: 2an + -2an = 0
-1an = -3 + 0
-1an = -3

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

Simplifying
a = 3n-1

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