Question 1170036
y=a(x-h)^2+k
=a(x-9)^2-1, change sign of x and keep sign of y
when x=7 y=7
so 7=a(-2)^2-1=4a-1
so a=2
answer is y=2(x-9)^2-1

{{{graph(300,300,-10,20,-10,200,2(x-9)^2-1)}}}

{{{graph(300,300,3,12,-10,10,7,2(x-9)^2-1)}}}