# How do I find the domain of #f(x)=2x#?

Since the problem is very simple, I would like not to bother you with theory or definitions, but just try to think about what your problem means.

So, the problem with domains is: "which numbers would my robot refuse?" "When the operation I'm trying to do is not allowed?"

In your case, your function takes a number, and doubles it. Is there any number you can't double? Of course not, since the double of a number is well defined for every number.

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The domain of ( f(x) = 2x ) is all real numbers.

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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