I have a question about onto and one-to-one.?

Determine(with an explanation) whether this function is one-to-one and whether it is onto.
f:R-->RxR, where f(x)=(x^2, 2x+1). I honestly know this is probably very simple but I have not idea where to start. I'm not even sure what this function means. Can someone please help? I am so confused.

Thank you to anyone that can help!

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