# How do you write  f(x)=x^2-7x + 9 in vertex form?

${\left(x - \frac{7}{2}\right)}^{2} - \frac{13}{4}$
$\left({x}^{2} - 7 x + \frac{49}{4}\right) + 9 - \frac{49}{4}$
${\left(x - \frac{7}{2}\right)}^{2} - \frac{13}{4}$