Algebraic Equations with Multiple Variables

[sammiyahc0]

f(x)=(x^5)/x^2+6 and f(x)=2x^3-4x



I tried x=(y^5)/(y^2+6) then x(y^2+6)=y^5 but idk after and
y=2x^3-4x then idk what to do

 

[brmath]

Are you asking what are the inverse functions for these polynomials? If so, do you know the exact definition of "inverse function"? And if you do, would you start by stating the inverse function if $f(x) = x^5$. Does that give you enough clue how to proceed?

If you aren't sure of the definition, it is certainly going to be impossible to do these problems. So look it up on the internet. I'll bet it's crawling with websites that discuss inverse functions and give examples.

 

[berkeman]

f(x)=(x^5)/x^2+6 and f(x)=2x^3-4x



I tried x=(y^5)/(y^2+6) then x(y^2+6)=y^5 but idk after and
y=2x^3-4x then idk what to do

Your post doesn't make sense to me. Can you please type the full question? And please use parens in your equations, so that the order of precedence is unambiguous. Even better would be to type them in LaTex:

https://www.physicsforums.com/showthread.php?t=710433