Solve for a an=an-1+an-2

Math
Since is on the right side of the equation, switch the sides so it is on the left side of the equation.
Simplify .
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Add and .
Subtract from .
Move all terms containing to the left side of the equation.
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Subtract from both sides of the equation.
Subtract from .
Multiply by .
Add to both sides of the equation.
Divide each term by and simplify.
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Divide each term in by .
Cancel the common factor of .
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Cancel the common factor.
Divide by .
Solve for a an=an-1+an-2

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