Find the formula of function f(x) from a function equation | Middle School Math Olympiad question

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How to solve a function equation to find the formula of function f(x)? In this video, we'll use the denifition of function and the basic algebraic method of solving equation to get the function f(x). This is a Mathematical Olympiad question.

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0:03
I thought you said "Hallo*, Halloween!"
*Hallo=Hello

SuperYoonHo
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Let x=y=0
f(1)=2
Let y=0
f(1)=f(x)-1-x+2
f(x)=x+1

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