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

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