SOLUTION: solve square root of 12-r =r

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Question 671898: solve square root of 12-r =r
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
sqrt%2812-r%29+=r

12-r+=r%5E2

12-r+-+r%5E2+=+0

-r%5E2-r%2B12+=+0

r%5E2%2Br-12+=+0

%28r%2B4%29%28r-3%29+=+0

r%2B4=0 or r-3+=+0

r=-4 or r=3

Those are the *possible* solutions. You need to check them both to verify if they are both solutions. I'll let you do this.