Nomer 28 apa yaa? Tolong bantu dong, besok mau tryout hehe

2x^2+x-15=0

x1+x2= -b/a= -1/2

x1.x2 =c/a= -15/2

1/x1 + 1/x2 = (x1+x2) / (x1.x2)

= (-1/2) /( -15/2)

= -1/2 × -2/15

= 1/15 D