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If \(log_a 3\) = m and \(log_a 5\) = p, find \(log_a 75\)

Mathematics
WAEC 2023

If \(log_a 3\) = m and \(log_a 5\) = p, find \(log_a 75\)

  • A. \(m^2 + p \)
  • B. 2m + p
  • C. m + 2p
  • D. \(m + p^2\)
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Correct Answer: Option C
Explanation

Given: \(log_a 3\) = m and \(log_a 5\) = p
\(log_a 75\) = \(log_a (3 × 25)\)
= \(log_a (3 × 5^2)\)
= \(log_a 3 + log_a 5^2\)
= \(log_a 3 + 2log_a 5\)
Since \(log_a 3\) = m and \(log_a 5\) = p
∴ \(log_a 75\) = m + 2p


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NECO June/July 2024 - Get offline past questions & answers - Download objective & theory, all in one app 48789
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
Join your school's WhatsApp group
NECO June/July 2024 - Get offline past questions & answers - Download objective & theory, all in one app 48789
Join your school's WhatsApp group
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts