x2+4x−2=0x^{2}+4 x-2=0x2+4x−2=0
x2+4x−1=0x^{2}+4 x-1=0x2+4x−1=0
x2+2x−1=0x^{2}+2 x-1=0x2+2x−1=0
x2−4x−1=0x^{2}-4 x-1=0x2−4x−1=0
