Final answer to the problem
$f\left(x\right)=4-4x+x^2$
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Apply the formula: $\left(a+b\right)^2$$=a^2+2ab+b^2$, where $a=2$, $b=-x$ and $a+b=2-x$
$f\left(x\right)=4-4x+x^2$
Final answer to the problem
$f\left(x\right)=4-4x+x^2$
