Question

Please solve Q-15....

Answer 1

==> (x^2 + x +1)^2 + (x^2 - x + 1) ^2

==> (x^4 + x^2 + 1 + 2x^3 + 2x^2 + 2x)+ (x^4 + 1 + x^2 + 2x^2 + 2x^3 - 2x )

==> 2x^4 + 2x^2 + 2 + 4x^3

==> 2x^4 + 4x^3 + 2x^2 + 2

Therefore the coefficient of x^2 in the above solution is 2

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