Question

How to do this I’m lost

Answer 1

`y=9-x^2\ \ \ |-9\\\\y-9=-x^2\ \ \ \ |change\ the\ signs\\\\x^2=9-y\to x=√(9-y)`

`We\ have\ y^(-1)=√(9-x)\\\\D:\\9-x\geq0\to x\leq9\\\\x\in\left(-\infty;\ 9\right>`