# Math Help - estimate flux

1. ## estimate flux

The points (1, 2, -2) and (0, 3, 0) are both on the sphere $x^2 + y^2 + z^2 = 9$. Estimate $\vec{F}$ at (0, 3, 0).

well so far I have calculated $\vec{F}$ at (1,2,-2) however I don't know what the next step is

2. anyone?