Math Problem Statement

(i × j) × k

Solution

The problem asks to find the vector (i×j)×k(\mathbf{i} \times \mathbf{j}) \times \mathbf{k} using the properties of cross products rather than using determinants.

Let's break it down:

  1. Step 1: Compute i×j\mathbf{i} \times \mathbf{j}
    From the standard basis vectors in 3D, we know that: i×j=k\mathbf{i} \times \mathbf{j} = \mathbf{k} So, (i×j)=k(\mathbf{i} \times \mathbf{j}) = \mathbf{k}.

  2. Step 2: Compute k×k\mathbf{k} \times \mathbf{k}
    Now, we need to compute k×k\mathbf{k} \times \mathbf{k}. The cross product of any vector with itself is always the zero vector: k×k=0\mathbf{k} \times \mathbf{k} = \mathbf{0}

Therefore, the result of (i×j)×k(\mathbf{i} \times \mathbf{j}) \times \mathbf{k} is the zero vector: (i×j)×k=0(\mathbf{i} \times \mathbf{j}) \times \mathbf{k} = \mathbf{0}

Would you like more details on cross product properties or further explanation?

Here are five related questions to expand on this topic:

  1. What is the geometric interpretation of the cross product?
  2. How do the properties of the cross product change in higher dimensions?
  3. How can you compute the cross product using determinants?
  4. What is the scalar triple product involving cross products?
  5. How do we calculate the magnitude of a cross product?

Tip: Remember, the cross product of two parallel vectors is always the zero vector!

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Math Problem Analysis

Mathematical Concepts

Cross Product
Vector Operations

Formulas

i × j = k
k × k = 0

Theorems

Cross product of unit vectors
Cross product of a vector with itself

Suitable Grade Level

Grades 10-12