Express the function $f(x)=2x^2-12x+23$ in the form $a(x-p)^2+q$.
In this question, $a=2$, $p=3$ and $q=5$. One advantage of this form is that, since $(x-3)^2\geq 0$, we can read off that $f(x)\geq 5$ and that the least value of the function occurs when $x=3$
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