What is the opposite of x^2.8? I need it for graphmatica

Question

What is the opposite of x^2.8? I need it for graphmatica

Answer 1

If y = x^n, then the inverse function ("opposite") is:

x = logn(y),

where the exponent n becomes the base of the logarithm. In your case the base is 2.8.

If you are more comfortable working with logarithms in terms of base 10,

x = log(y)/log(2.8), or

x = 2.236*log(y).