Answer my question sir please
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4x^3 + 2x^2 - 8x + 7
2x(x^2 + x - 4) + 7
2x ( x^2 + x + 1/4 -17/4)+ 7
2x ((x + 1/2)^2 - 17/4)+7
Now given
x = (sqrt3 + 1)/2
on putting
(sqrt3 + 1)((sqrt3 + 3)^2/4- 17/4 )+7
(sqrt3 + 1)(sqrt3/4)+7
3/4 + sqrt3/4 + 7
(31 + sqrt3)/4
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