f(1+2)=3f(1+1)-f(1)

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Solution for f(1+2)=3f(1+1)-f(1) equation: 



f(1+2)=3f(1+1)-f(1)

We move all terms to the left:

f(1+2)-(3f(1+1)-f(1))=0

We add all the numbers together, and all the variables

f3-(3f2-f1)=0

We add all the numbers together, and all the variables

f^3-(3f2-f1)=0

We get rid of parentheses

f^3-3f2+f1=0

We do not support efpression: f^3

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