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If a = \(\left| \begin{array}{cc} 3 \\ 2 \end{array} \right|\) and b = \(\left| \begin{array}{cc} -3 \\ 5\end{array}...

Further Mathematics
WAEC 2025

If a = \(\left| \begin{array}{cc} 3 \\ 2 \end{array} \right|\) and b = \(\left| \begin{array}{cc} -3 \\ 5\end{array} \right|\). Find the vector c such that 4a + 3c = b

  • A. \(\left| \begin{array}{cc} -5 \\ 1\end{array} \right|\)
  • B. \(\left| \begin{array}{cc} 3 \\ 1\end{array} \right|\)
  • C. \(\left| \begin{array}{cc} -5 \\ -9\end{array} \right|\)
  • D. \(\left| \begin{array}{cc} -5 \\ -1\end{array} \right|\)
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
Correct Answer: Option D
Explanation

4a + 3c = b

4a = 4 \(\left| \begin{array}{cc} 3 \\ 2 \end{array} \right|\) =  \(\left| \begin{array}{cc} 12 \\ 8 \end{array} \right|\)

b = \(\left| \begin{array}{cc} -3 \\ 5\end{array} \right|\)

3c = \(\left| \begin{array}{cc} -3 \\ 5\end{array} \right|\) -  \(\left| \begin{array}{cc} 12 \\ 8 \end{array} \right|\) = \(\left| \begin{array}{cc} -15 \\ -3\end{array} \right|\)

3c = \(\left| \begin{array}{cc} -15 \\ -3\end{array} \right|\)

c = \(\frac{1}{3}\) \(\left| \begin{array}{cc} -15 \\ -3\end{array} \right|\) = \(\left| \begin{array}{cc} -5 \\ -1\end{array} \right|\)


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