Solving Quadratic Equations by Completing The Square

Mathematics
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r^2 - 20r - 45 = -6

May 9th, 2015

r^2 - 20r - 45 = -6

So : r^2 - 20r - 39 = 0

so : delta = 400 + 156 = 556 > 0

so existe to solution : 

r1 = (20 - sqrt(556))/2 

r2 = (20 + sqrt(556))/2 

Good LUck 

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Your friend Karim

May 9th, 2015

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