Question

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

11th - 12th Class

Maths

Solution

272

4.0 (1 ratings)

( 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}) )