x^2+x-1=0x^2+x=1(x^2+x+1/4-1/4)=1(x+1/2)^2=5/4x+1/2=±(√5)/2x1=(1+√5)/2x2=(1-√5)/2
X^2+X-1=0X^2+X=1(X+1/2)^2=1+1/4(X+1/2)^2=5/4X+1/2=±√5 /2X=1/2±√5 /2X=(1±√5)/2