A2 June 2020 Paper 2 Q1

1 Three of the four expressions below are equivalent to each other.

Which of the four expressions is not equivalent to any of the others?

Circle your answer. [1 mark]

• \(\mathbf{a} \times (\mathbf{a} + \mathbf{b})\)
• \((\mathbf{a} + \mathbf{b}) \times \mathbf{b}\)
• \((\mathbf{a} - \mathbf{b}) \times \mathbf{b}\)
• \(\mathbf{a} \times (\mathbf{a} - \mathbf{b})\)