Question 67221
(x - (2 + sqrt(5))*(x - (2 - sqrt(5))
(x - 2 - sqrt(5))*(x - 2 + sqrt(5))
x^2 - 2x - sqrt(5)x - 2x + 4 + sqrt(5)2 + sqrt(5)x - sqrt(5)2 - 5
x^2 - 4x - 1 = f(x)
{{{graph(300,300,-4,7,-10,10,x^2 - 4x - 1)}}}