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Mathematics JAMB Past Questions

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551
If a binary operation * is defined by x * y = x + 2y, find 2 * (3 * 4)
  • A. 24
  • B. 16
  • C. 14
  • D. 26
View Answer & Discuss JAMB 2013
552

If P = \(\begin{pmatrix} 5 & 3 \\ 2 & 1 \end{pmatrix}\) and Q = \(\begin{pmatrix} 4 & 2 \\ 3 & 5 \end{pmatrix}\), find 2P + Q

  • A. \(\begin{vmatrix} 7 & 7 \\ 14 & 8 \end{vmatrix}\)
  • B. \(\begin{vmatrix} 14 & 8 \\ 7 & 7 \end{vmatrix}\)
  • C. \(\begin{vmatrix} 7 & 7 \\ 8 & 14 \end{vmatrix}\)
  • D. \(\begin{vmatrix} 8 & 14 \\ 7 & 7 \end{vmatrix}\)
View Answer & Discuss JAMB 2013
553

Find the inverse \(\begin{pmatrix} 5 & 3 \\ 6 & 4 \end{pmatrix}\)

  • A. \(\begin{vmatrix} 2 & -\frac{3}{2} \\ -3 & -\frac{5}{2} \end{vmatrix}\)
  • B. \(\begin{vmatrix} 2 & -\frac{3}{2} \\ -3 & \frac{5}{2} \end{vmatrix}\)
  • C. \(\begin{vmatrix} 2 & \frac{3}{2} \\ -3 & \frac{5}{2} \end{vmatrix}\)
  • D. \(\begin{vmatrix} 2 & \frac{3}{2} \\ -3 & \frac{5}{2} \end{vmatrix}\)
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554
If y = x sin x, find \(\frac{\delta y}{\delta x}\)
  • A. sin x - cos x
  • B. cos x - x sin x
  • C. cos x + x sin x
  • D. sin x + x cos x
View Answer & Discuss (1) JAMB 2013
555

If y = (2x + 2)\(^3\), find \(\frac{\delta y}{\delta x}\)

  • A. 3(2x +2)2
  • B. 6(2x +2)
  • C. 3(2x +2)
  • D. 6(2x +2)2
View Answer & Discuss (1) JAMB 2013
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