For the function y = f(x) = x^5 + 2x^3 + 3x + 1
How do I go about expressing x in terms of y?
Thanks.
Hello tashbo
Welcome to Math Help Forum!Without wishing to sound frivolous: with great difficulty! The answer is that you may be able to find a value (or possibly several values) of $\displaystyle x$, given a specific value of $\displaystyle y$, but you won't be able to find a formula that will do it for any value of $\displaystyle y$. This is because there's no straightforward way of solving an equation like this - with terms in $\displaystyle x^5,\, x^3$ and $\displaystyle x$.
Grandad
This is essentially the same question that you've already asked. The reply given by Grandad still applies.
Post the original question! What I've highlighted in red implies crucial missing information - it's almost certain that you don't have to find the rule for the inverse function.
It seems that I have repeated myself as I am having difficulty understanding the question I am trying to answer - it was not intentional and I apologise.
I have to prove that f^-1(7) = 1 and I don't know how to do this without knowing the inverse of the function given.Originally Posted by Mr Fantastic