SOLUTION: What is the positive root of the equation 3x²-27=0? 1)9 2)-9 3)3 4)-3

Algebra ->  Equations -> SOLUTION: What is the positive root of the equation 3x²-27=0? 1)9 2)-9 3)3 4)-3      Log On


   

Question 198917: What is the positive root of the equation 3x²-27=0?
1)9
2)-9
3)3
4)-3
Answer by anantha(86) About Me  (Show Source):
You can put this solution on YOUR website!
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