Question 75693
Since the graph is opening upward, we know the leading coefficient is positive and we know its a quadratic since its a parabola. So lets try {{{y=2x^2}}}
{{{20=2(-1)^2}}} Plug in (-1,20
{{{20=2}}} not true. So thats not the equation
Lets try
{{{y=x^2-4x}}} Plug in (-1,20)
{{{20=(-1)^2-4(-1)}}}
{{{20=1+4}}}
{{{20=5}}} not true. So thats not the equation

{{{y=x^2+1}}} Plug in (-1,20)
{{{20=(-1)^2+1}}}
{{{20=1+1}}}
{{{20=2}}} not true. So thats not the equation

It seems that none of these equations work. Double check your graph to see if you copied the coordinates down right.