Question 101417
From the graph below you can see that f(x)=-5x^2+12 doesn't have an inverse function because it doesn't have a one-to-one rlationship. It doesn't pass the horizontal line test which states that a horizontal line drawn across the graph
intesects the graph at most once.
Ed
{{{graph(500,500,-10,10,-10,10,-5x^2+12)}}}