SOLUTION: how to decide whether the relation defines y as a function of x and give the domain for y=x2?

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Question 218261: how to decide whether the relation defines y as a function of x and give the domain for y=x2?
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
First, graph the relation. Does the graph pass the vertical line test? If it does, then the relation is a function.


To find the domain, ask yourself: what numbers can't I plug in? Are there possible divisions by zero or square roots of negative values? Are there any logs or any other restrictive functions present?

Since x%5E2 is a simple polynomial, this means we can plug in any real number and get a real number out. So this means that the domain is all real numbers.