Question 181286
to find the inverse of a function y is substituted for x and x is substituted for y
:
{{{x=sqrt(y+9)}}}
:
{{{x^2=y+9}}} after squaring both sides
:
{{{y=x^2-9}}}
:
which is a parabola and a function
:
{{{graph(300,300,-10,10,-10,10,x^2-9)}}}