What is a × b?

What is a × b?

Question 114

MediumOriginal question

A parallelogram has adjacent sides $\vec{a} = 2\hat{i} + \hat{j} + 2\hat{k}$ and $\vec{b} = 2\hat{i} + 3\hat{j} - 2\hat{k}$ .

What is $\vec{a} \times \vec{b}$ ?

-8\hat{i} - 8\hat{j} + 4\hat{k}

Correct answerYour answer

8\hat{i} - 8\hat{j} - 4\hat{k}

Correct answerYour answer

-8\hat{i} + 8\hat{j} + 4\hat{k}

Correct answerYour answer

-8\hat{i} + 8\hat{j} - 4\hat{k}

Correct answerYour answer

Show the answer and explanation

CorrectNot quiteAnswer C

Correct answer: C

Worth noting

$-8\hat{i} - 8\hat{j} + 4\hat{k}$ forgets the minus sign in front of the $\hat{j}$ term.

Ten questions from Vectors, at your own pace.

Ten questions from Vectors, at your own pace.