x·x+3x-1=0
x·x=1-3x
x·x+1/x·x
=1-3x+1/(1-3x)
=[(1-3x)(1-3x)+1]/(1-3x)
=(1-6x+9x·x+1)/(1-3x)
=[2-6x+9(1-3x)]/(1-3x)
=2+9
=11