Nevermind. I was doing the cross product wrong. I was forgetting to switch the signs for it. Arg, so much frustration over that little issue.
I'm pretty sure I'm making a small mistake on these problems. I've done several they way I'm sure it's done, and rechecked them and they always come back as incorrect.
Here's an example problem:
at the point (9, 6, 45)
From this I get that:
I'm getting the answer:
How far off am I? I can post all my steps if needed.