If \(P = \begin{vmatrix} 1 & 1 \\ 2 & 1 \end{vmatrix}\), find \((P^{2} +
FURTHER MATHEMATICS
WAEC 2009
If \(P = \begin{vmatrix} 1 & 1 \\ 2 & 1 \end{vmatrix}\), find \((P^{2} + P)\).
- A. \(\begin{vmatrix} 4 & 3 \\ 6 & 1 \end{vmatrix}\)
- B. \(\begin{vmatrix} 4 & 3 \\ 6 & 4 \end{vmatrix}\)
- C. \(\begin{vmatrix} 2 & 2 \\ 6 & 2 \end{vmatrix}\)
- D. \(\begin{vmatrix} 3 & 2 \\ 6 & 4 \end{vmatrix}\)
Correct Answer: B. \(\begin{vmatrix} 4 & 3 \\ 6 & 4 \end{vmatrix}\)
Explanation
\( P^{2} = \begin{vmatrix} 1 & 1 \\ 2 & 1 \end{vmatrix} \begin{vmatrix} 1 & 1 \\ 2 & 1 \end{vmatrix}\)
\(\begin{vmatrix} 1 \times 1 + 1 \times 2 & 1 \times 1 + 1 \times 1 \\ 2 \times 1 + 1 \times 2 & 2 \times 1 + 1 \times 1 \end{vmatrix}\)
= \(\begin{vmatrix} 3 & 2 \\ 4 & 3 \end{vmatrix} + \begin{vmatrix} 1 & 1 \\ 2 & 1 \end{vmatrix}\)
= \(\begin{vmatrix} 4 & 3 \\ 6 & 4 \end{vmatrix}\)
Post an Explanation Or Report an Error
If you see any wrong question or answer, please leave a comment below and we'll take a look. If you doubt why the selected answer is correct or need additional more details? Please drop a comment or Contact us directly. Your email address will not be published. Required fields are marked *