Question 176793
You can check this way:
{{{(x - (4 + 2*sqrt(3)))*(x - (4 - 2*sqrt(3))) = 0 }}}
{{{x^2-(4+2*sqrt(3))*x - (4-2*sqrt(3))*x + (4+2*sqrt(3))*(4 - 2*sqrt(3)) = 0}}}
{{{x^2 - 4x - 2*sqrt(3)*x - 4x + 2*sqrt(3)*x + 16 - 12 = 0}}}
{{{x^2 - 8x + 4 = 0}}}
You were right