Help???

Question

Help???

anonymous · Answer

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anonymous · Answer

$$\sqrt{2} -2$$
That is the denominator. The hint states that you should rationalize it. 
How can we do this?

anonymous · Answer

You need to multiply by something. 
Hint: (a-b)*(a+b)=a^2-b^2

anonymous · Answer

I don't understand how to do that.

anonymous · Answer

What does rationalize mean? 
Basically you need to get rid of the irrational part of the above expression. 
So that it will be a regular number. 
Lets say you have $$\sqrt{2}$$
Now if you wish to rationalize it you will have to multiply it by itself as
$$\sqrt{2} *\sqrt{2} =2$$

anonymous · Answer

However we have a bit more complicated formula here. 
So what you need to figure out is how to get a normal number from $$\sqrt{2} -2$$

anonymous · Answer

So B..?

anonymous · Answer

LOL I dont know.

anonymous · Answer

I am not going to just give the answer to you. I can help you understand the problem but if you wish to skip the thinking part than I am not your person.