how to solve this 3 question help me plz
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4x^3+2x^2-8x+7
4×{(√3+1)/2}^3+2 ×{(√3+1)/2}^2-8× {(√3+1)/2}+7
4×({3√3+1)/8}+2×{(3+1)/4}-{(8√3+8)/2}+7
{(3√3+1)/2}+2×(4/4)- {(8√3)/2}+(8/2)+7
{(3√3+1)/2}+(2×1)- {(8√3)/2} +4+7
{(3√3+1)/2}+(4/2) - {(8√3)/2}+(22/2)
(3√3+1+4-8√3+22)/2
(-5√3+27)/2
(27-5√3)/2
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