Solution function y = x & # 178; - 2x - 1 = 0 Quick solution to one decimal

Solution function y = x & # 178; - 2x - 1 = 0 Quick solution to one decimal

x² - 2x - 1=0
(x-1)²=1+1
x-1=±1.414
X = 2.414 or x = - 0.414