- #1

- 117

- 0

2,1,-1

1,1,0

2,-1,3

are coplanar. i take the triple product, finding the determinant of the matrix. it seems to be non-zero, but the answer key insists these are coplanar. am i wrong, or perhaps the book? any input would be appreciated!

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- Thread starter teclo
- Start date

- #1

- 117

- 0

2,1,-1

1,1,0

2,-1,3

are coplanar. i take the triple product, finding the determinant of the matrix. it seems to be non-zero, but the answer key insists these are coplanar. am i wrong, or perhaps the book? any input would be appreciated!

- #2

Galileo

Science Advisor

Homework Helper

- 1,989

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You're right. Did you copy the problem correctly?

- #3

- 1,356

- 2

did you check the vectors out themselves?...? they are coplanar.

- #4

- 117

- 0

- #5

Galileo

Science Advisor

Homework Helper

- 1,989

- 6

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