SOLUTION: I find no factoring for 27r2 - 72 = 0. I want to know how the answer of 0=0 is calculated? Thanks.

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons  -> Quadratic Equation Lesson -> SOLUTION: I find no factoring for 27r2 - 72 = 0. I want to know how the answer of 0=0 is calculated? Thanks.      Log On


   

Question 392208: I find no factoring for 27r2 - 72 = 0. I want to know how the answer of 0=0 is calculated? Thanks.
Answer by Earlsdon(6294) About Me  (Show Source):
You can put this solution on YOUR website!
27r%5E2-72+=+0 Factor 9.
9%283r%5E2-8%29+=+0 so...
3r%5E2-8+=+0 Add 8 to both sides.
3r%5E2+=+8 Divide both sides by 3.
r%5E2+=+8%2F3 Take the square root.
r+=+sqrt%288%2F3%29