Question

( x^{2}-4 x-1=0 )
( a=1, b=-4, c=-1 )
( x=-frac{b pm sqrt{b^{2}-4 a c}}{2 a} )
( x=frac{1 pm sqrt{16-4(-1)}}{2} )
( x=2 pm sqrt{5} )
( x ) ors ( rightarrow(2+sqrt{5}),(2-sqrt{5}) )

# Find the roots of each of the quadratic formula: 2. x² - 4x-1=0

Solution