Akar-akar persamaan kuadrat 2x^2 + × - 5 = 0 adalah alpa dan beta. Nilai alpa/beta + beta/alpa = ....

akar-akar = a dan b

2x²+x-5 = 0
a+b = -1/2
a.b = -5/2

a/b + b/a
= (a²+b²)/ab
= ((a+b)²-2ab)/ab
= ((-½)²-2(-5/2)/(-5/2)
= (¼+5)/(-5/2)
= (21/4)/(-5/2)
= -21/10
(E)