Find real values of x for which x^2 + x + 1, 2x + 1 and x^2 - 1 represrnt three sides of a triangle. Prove that for each of the admissible values of x, the greatest angle of the triangle is 120 deg.

Dear student,

Its a simple question:

Make use of the property that sum of two sides of a triangle is greater than than the third side...

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