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Which of these functions has an inverse function? Select all that apply.

y = x
y = x2
y = x3
y = x4

User Zhenming
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2 Answers

3 votes

Answer:

y=x3 and y=3

Explanation:

IGIR (I got it right)

User Eduardo Soares
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So we want to know which of the following functions has an inverse function. So an inverse function is a function that "reverses" another function. We need to put y instead of x and x instead of y. So for the first case: y=x is x=y so this function has an inverse function. y=x^2 is x=y^2 so y=sqrt(x). y=x^3 is x=y^3 so y=∛x. y=x^4 so x=y^4, y=4√x or forth root of x. So all of our functions have an inverse function. 
User Viktor Vlasenko
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