Answer
$$28-10\sqrt{3}$$
Work Step by Step
We are told:
$$f(x)=x^2$$
Thus, plugging in the given value for $x$, we find:
$$ \left(5-\sqrt{3}\right)^2\\ 5^2-2\cdot \:5\sqrt{3}+\left(\sqrt{3}\right)^2\\ 28-10\sqrt{3}$$
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