SOLUTION: Could you please help me with figuring out how to do this problem? r^2+3r=5 I cannot figure it out....Please and Thanks so much!!!

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Question 208231: Could you please help me with figuring out how to do this problem?
r^2+3r=5
I cannot figure it out....Please and Thanks so much!!!
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
r^2+3r=5
r^2+3r-5=0
Using the quadratic equation x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+ we get:
r=(-3+-sqrt[3^2-4*1*-5])/281
r=(-3+-sqrt[9+20])/2
r=(-3+-sqrt29)/2
r=(-3+-5.385)/2
r=(-3+5.385)/2
r=1.1925 ans.
r=-3-5.385/2
r=-8.385/2
r=-4.19 ans.