SOLUTION: Professor is X cubed minus 5 a one to one function? I'm confused. Thanks for your help!

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Question 688297: Professor is X cubed minus 5 a one to one function? I'm confused. Thanks for your help!
Found 2 solutions by jim_thompson5910, josmiceli:
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
If you graph x%5E3-5, you get this



since it passes the horizontal line test, it is one-to-one.

Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Here's the plot of +y+=+x%5E3+-+5+
+graph%28+400%2C+400%2C+-4%2C+4%2C+-10%2C+3%2C+x%5E3+-+5+%29+
I would say it is a 1 to 1 function, because
there is 1 value of x for each value of y.
--------------
Here is a classic case of many values of x for
each value of y. It is +y+=+sin%28x%29+
+graph%28+400%2C+400%2C+-10%2C+10%2C+-2%2C+2%2C+sin%28x%29+%29+
It is not a 1 to 1 function