Question 928920
{{{y=-x^2-10x-20}}}
{{{y=-(x^2+10x)-20}}}
{{{y=-(x^2+10x+25)-20+25}}}
{{{y=-(x+5)^2+5}}}
Now the parabola is in vertex form.
Vertex (-5,5)
Opens downwards.
.
.
.

{{{graph(300,300,-10,10,-10,10,-x^2-10x-20)}}}