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## Homework Statement

Go through question number 4

## Homework Equations

## The Attempt at a Solution

See basically the question is asking us to find the range of the given function x/(x^2+x+1).

So,I began solving it this way...

I am stuck at this step.

I asked my friend for a hint and he told me to apply the condition that Determinant(D)>=0.

But,I am unable to understand why D>=0?

I will be thankful for help!

#### Attachments

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