# What is the vertex form of y=x^2+15x+36 ?

$y = {\left(x + \frac{15}{2}\right)}^{2} - \frac{81}{4}$
$y = {x}^{2} + 15 x + 36$
$y = \left({x}^{2} + 15 x + \frac{225}{4}\right) - \frac{81}{4}$
$y = {\left(x + \frac{15}{2}\right)}^{2} - \frac{81}{4}$