# Math Help - Need Help Graphing

1. ## Need Help Graphing

I need to graph the function: Find and show on the graph, the vertex, y-intercept, x-intercept if any, the axis of symmetry. I think I have the answers. I just don't no how to graph it. I believe it's a parabola. The function is f(x)=2x2+4x-30
Vertex-1,-32)
y-intercept0,-30)
x-intercept-5,3)
axis of symmetry:-1
Domain:All Real Numbers
Range:[-2,infinity)

Thanks,
Freedom100

2. Hello

It is a parabola

If you need to draw the graph by hand then you can make a table of values for x and y.

$\begin {tabular}{c c c c c c c c c c c c}
x & -6 & -5 & -4 & -3 & -2 & -1 & 0 & 1 & 2 & 3 & 4 \\
y & 18 & &-14&-24& & &-30& & & 0
\end {tabular}
$

Complete the table by substituting the values of x in to, $y = 2x^2+4x-30$ and then plot the points.
Or use graphing software, if you are 'allowed'.

Check your x - intercepts, there are two. The values of x when y = 0. They are both in your table.