How do I graph these parabolas

Key Takeaways
The graph of any quadratic equation y=ax2+bx+c y = a x 2 + b x + c , where a, b, and c are real numbers and a≠0 a ≠ 0 , is called a parabola.
When graphing parabolas, find the vertex and y-intercept. ...
Use the leading coefficient, a, to determine if a parabola opens upward or downward.