SOLUTION: r^2-9=0 how would you slove this?

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Question 326433: r^2-9=0
how would you slove this?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
+r%5E2-9=0
Factoring,
+%28r%2B3%29%28r-3%29=0
Two solutions:
+r%2B3=0
+r=-3
.
.
+r-3=0
+r=3
.
.
Directly,
+r%5E2=9
+r=0+%2B-+3