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# FP4 Vector Planes watch

1. A=(1,-8,-2) b=(9,2,4)

the plane p contains the point b and is perpendicular to AB. Find the equation of the plane.

Please help- does it mean direction vector AB or A times B? And if it were A times B, would the normal to the plane be A times B or would it be parallel to A and B?

I would really appreciate some help if you can
2. (Original post by albyedw)
A=(1,-8,-2) b=(9,2,4)

the plane p contains the point b and is perpendicular to AB. Find the equation of the plane.

Please help- does it mean direction vector AB or A times B? And if it were A times B, would the normal to the plane be A times B or would it be parallel to A and B?

I would really appreciate some help if you can
A times B is meaningless

it is asking you to find the equation of a plane where point B lies on the plane and the vector AB is the normal
3. (Original post by albyedw)
A=(1,-8,-2) b=(9,2,4)

the plane p contains the point b and is perpendicular to AB. Find the equation of the plane.

Please help- does it mean direction vector AB or A times B? And if it were A times B, would the normal to the plane be A times B or would it be parallel to A and B?

I would really appreciate some help if you can
A and B are supposed to be points. You can't multiply points.
4. the line segment AB is perpendicular to the plane.
5. thanks. Does that mean b-a is my normal?
6. (Original post by albyedw)
thanks. Does that mean b-a is my normal?
Yes.

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