Hi everyone...

I was looking for an inverse function to: y = x^5 - 3x^4 + 7

What WA gave was the following: y(x) = Root[#1^5-3 #1^4-x+7&, 1]

y(x) = Root[#1^5-3 #1^4-x+7&, 2]

y(x) = Root[#1^5-3 #1^4-x+7&, 3]

y(x) = Root[#1^5-3 #1^4-x+7&, 4]

y(x) = Root[#1^5-3 #1^4-x+7&, 5]

My questions is....what is this?! lol

Even when I whittle this down to: y = x^5 - 3x I still get a similar output.

I'm pretty familiar with the algebraic process of finding an inverse, and while I do realize these are more complicated functions, I still don't understand what WA's 'notation' stands for. However, I know what "Root" means, it's the rest I have a problem with.

Any ideas please?

Thanks