Question 871369
{{{graph(300,300,-1,9,-45,5,-(x-5)^2)}}} is the graph of {{{y=-(x-5)^2}}}
We can move the graph up:
{{{graph(300,300,-1,9,-5,45,-(x-5)^2+40)}}} is the graph of {{{y=-(x-5)^2+40}}}
We can make the increase and decrease steeper:
{{{graph(300,300,-1,9,-55,45,-10(x-5)^2+40)}}} is the graph of {{{y=-10(x-5)^2+40}}}
We can move the graph down , and/or make the increase and decrease less steep,
but it should always have a maximum at {{{x=5}}} .