Question 198917
sol:
3x^2-27=0
adding 27 on both sides
3x^2-27+27=0+27
3x^2=27
dividing by 3 on both sides
3x^2/3=27/3
x^2=9
x=sqrt(9)                        (i.e;sqrt(9)=sqrt(3*3)=3)
x=plus or minus  3
the positive root of given equation is 3