Graph math problem will give you a better experience of solving problems. Imaging too. But so sad that I can't draw graphs for this book on this period of time.

Why does this happen? We could imagine, if goes on and on, to infinite, will more and more approaching .


There's another limit equation that similar to the above:

Why does this happen? If approach to , goes bigger and bigger, it's infinite.


As you can see, normally, if you are asked getting the limitation of a basic simple function, all you have to do is calculate the y value of f(x).


Above is a graph of .

If I ask you what's the limitation of , the real meaning is and exist and equal.

means x from less than 2 to 2, what y will be approaching

means x form greater than 2 to 2, what y will be approaching to.

Here comes a new definition of continuity when you think about it. No matter greater than 2 or less than 2, they all approaching 4, this means they are continuous in x

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