I think the answer is 0.52
I don't know if this is right but I think it is $4500
It opens upward when X is an even power. It would be for X squared or X raised to the 4th power.
Step-by-step explanation:
2x-12x+36 =90
-10x + 36 = 90
-10x =54
x = - 5.4
If sqrt x = 9 then x = 9*9 = 81
Answer is between 80 and 90.