Sketch the graph of the quadratic function $f(x) = 5 x^2 +8 x -6$ by hand.
Indicate on your sketch the coordinates of any turning points and of
any point where the graph crosses the $x$ or $y$ axis.
Your graph should look something like this.
Roots are $x = -2.16$ and $x = 0.56$.
There is a minimum point at $x=-0.80$, $y=-9.20$
The graph intercepts the $y$-axis at $y=-6$