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Simplify \(\frac{9*3^{n+1} - 3^{n+2}}{3^{n+1} - 3^{n}}\)

Further Mathematics
WAEC 2022

Simplify \(\frac{9*3^{n+1} - 3^{n+2}}{3^{n+1} - 3^{n}}\)

  • A. 3
  • B. 9
  • C. 27
  • D. 81
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Correct Answer: Option B
Explanation

\(\frac{9*3^{n+1} - 3^{n+2}}{3^{n+1} - 3^{n}}\)

= \(\frac{3^n * 3^n * 3^1 * - 3^2 * 3^2}{3^n * 3^1 - 3^n}\)

= \(\frac{3^n (3^2 * 3^1)}{3^n (3^1 - 1)}\)

= \(\frac{27-9}{3-1}\)

= \(\frac{18}{2}\)

= 9


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WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
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