# If #4-x^2>=0# isn't #x<=+-2#? I don't understand how #-2<=x<=2# is a result.

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#4-x^2>=0# isn't #x<=+-2# ?

I don't understand how #-2 <=x<=2# is the result?

I don't understand how

##### 1 Answer

Dec 28, 2017

Please see below.

#### Explanation:

As

This means product of

If both are positive we have

If both are negative we have

Hence answer is