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(2xsquare- 16x +60) have negative discriminant so we only have three roots : 3, -3 , -p/3 and some of these is 20/3 so p= -20
(2xsquare- 16x +60) have negative discriminant so we only have three roots : 3, -3 , -p/3 and some of these is 20/3 so p= -20