Question 859424
So you need to get to vertex form that looks like,
{{{ax^2+bx+10=-c(x-2)^2+18}}}
{{{ax^2+bx+10=-cx^2+4cx-4c+18}}}
Where
{{{a=-c}}}
{{{b=4c]}}
{{{-4c+18=10}}}
{{{-4c=-8}}}
{{{c=2}}}
So then,
{{{b=4(2)=8}}}
{{{a=-2}}}
{{{-2x^2+8x+10=-2(x-2)^2+18}}}