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
and please each time you need something call me first i will give you the great answer because i will be the top tutor in Studypool so help me as you can
Your friend Karim
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