- #1

- 11

- 0

## Homework Statement

The value of n so that vectors 2i + 3j - 2k , 5i + nj + k and -i + 2 j + 3k may be coplanar?

a)18 b)28 c)9 d)36

**2. The attempt at a solution**

I was not able to think of any step

so please help

- Thread starter jarman007
- Start date

- #1

- 11

- 0

The value of n so that vectors 2i + 3j - 2k , 5i + nj + k and -i + 2 j + 3k may be coplanar?

a)18 b)28 c)9 d)36

I was not able to think of any step

so please help

- #2

rl.bhat

Homework Helper

- 4,433

- 8

Hi jarman007, welcome to PF.

The vectors**A, B and C** are coplanar if** A.(BXC)** = 0

The vectors

- #3

- 11

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BxC = 10k -15j + nk + 3ni + j +2i = (3n+2)i -14j + (10+n)k

A.(BxC)=6n+4-42-20-2n=0

therefore n = 58/4

- #4

rl.bhat

Homework Helper

- 4,433

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This calculation is wrong.

Check i and j coefficients. My answer is 18.

- #5

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thanks

got the answer

got the answer

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