F(x) is the antiderivative of f(x), can be written this way:
∫fx)dx = F(x) + c
where c is constant.
Fx) = ∫(8/x2 - 2/x6) dx = ∫(8x-2 - 2x-6) dx
F(x) = -8x-1 + (2/5)x-5 + c
Substitute for F(1) = 0. Meaning when x=1, y=0
F(1) = -8(1)-1 + (2/5)(1)-5 + c = 0
-8 + 2/5 + c = 0
-38/5 + c = 0
c = 38/5
Therefore:
F(x) = -8x-1 + (2/5)x-5 + 38/5
or
F(x) = -8/x +2/(5x5) + 38/5