IB AA HL May 2026 P1 TZA Q9

IB AA HL May 2026 P1 TZA Q9

IB Year 6 | Grade 12
8 marks
IB May 2026 Examination

Consider non-zero vectors \(\mathbf{a}\), \(\mathbf{b}\) and \(\mathbf{c}\) in three-dimensional space.

The non-zero vector \(\mathbf{v}\) is defined as \(\mathbf{v}=(\mathbf{a}\cdot\mathbf{c})\mathbf{b}-(\mathbf{a}\cdot\mathbf{b})\mathbf{c}\).

  1. Show that \(\mathbf{v}\cdot\mathbf{a}=0\).[2]
  2. It is given that \(\mathbf{b}\times\mathbf{c}\) and \(\mathbf{a}\times(\mathbf{b}\times\mathbf{c})\) are non-zero vectors.
    1. Justify why \(\mathbf{b}\cdot(\mathbf{b}\times\mathbf{c})=0\).
    2. Show that \(\mathbf{v}\cdot(\mathbf{b}\times\mathbf{c})=0\).[4]
  3. Hence, state the geometrical relationship between \(\mathbf{v}\) and \(\mathbf{a}\times(\mathbf{b}\times\mathbf{c})\), briefly justifying your answer.[2]

Solution:

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Answer:(c) \(\mathbf{v}\parallel\mathbf{a}\times(\mathbf{b}\times\mathbf{c})\)

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