First of all, this is a very silly question, but I finished high school a long time ago and I really don't remember much about some basic stuff.
I have:
$T(x) = -\frac1{10}x^2 + \frac{24}{10}x - \frac{44}{10}$
$T$ = temperature
$x$ = hour
And they ask me to find the hour in which the temperature reached zero. So I know I must replace:
$0 = -\frac1{10}x^2 + \frac{24}{10}x - \frac{44}{10}$
It's very easy, I know, but I really don't remember how to clear/free the $x$ in this case. Could you guys help me?