## Precalculus (10th Edition)

We can disregard the rest of the equation and only look at the $2x^2$ at the start of the equation. In a quadratic function $f(x) = ax^2 + bx + c$, if $a \gt 0$, then the parabola opens up. However, if $a \lt 0$, then the parabola opens down. In this case, $a=2$ thus, the parabola opens up.