Tolong selesaikan soal berikut. x²-2x-1=0

X^2 – 2x – 1 = 0
untuk menentukan nilai x bisa rumus abc
a = 1
b = -2
c = -1

x1,x2 = [-b +/- √(b²-4ac)] / 2a
= [2 +/- √(-2)²-4(1)(-1)] / 2(1)
= [2 +/- √8]/2
= [1 +/- √2]

x1 = 1+√2
x2 = 1-√2

X = -b +- V(b^2 – 4ac)
   = 2 +- V(4 + 4)
   = 2 +- V8
   = 2 +- 2V2

x1 = 2 + 2V2
x2 = 2 – 2V2

ket : tanda V = akar