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a.b = -3
(-b-5) b = - 3
-b²-5b = -3
b²+5b = 3
b²+5b+(5/2)² = 3+(5/2)²
(b+5/2)² = 3+ 25/4
= 12+25/4
= 37/4
b+ 5/2 = 1/2 √37 dan - 1/2 √37
b = -5/2+ 1/2 √37 dan b = -5/2 - 1/2 √37
= -5+√37 / 2 = - (5+√37 / 2)
a.b = -3
a. (-5+√37 / 2) = -3 a.- (5+√37 / 2) = -3
a = -6 / -5+√37 dan a = 6 / 5+√37