CAIE FP1 2017 Specimen — Question 6

Exam BoardCAIE
ModuleFP1 (Further Pure Mathematics 1)
Year2017
SessionSpecimen
Topic3x3 Matrices

6 The matrix A, where $$\mathbf { A } = \left( \begin{array} { r r r } 1 & 0 & 0
10 & - 7 & 10
7 & - 5 & 8 \end{array} \right)$$ has eigenvalues 1 and 3 .
  1. Find corresponding eigenvectors.
    It is given that \(\left( \begin{array} { l } 0
    2
    1 \end{array} \right)\) is an eigenvector of \(\mathbf { A }\).
  2. Find the corresponding eigenvalue.
  3. Find a diagonal matrix \(\mathbf { D }\) and matrices \(\mathbf { P }\) and \(\mathbf { P } ^ { - 1 }\) such that \(\mathbf { P } ^ { - 1 } \mathbf { A P } = \mathbf { D }\).