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Solve \(5^{2(x - 1)} \times 5^{x + 1} = 0.04\)

Mathematics
JAMB 2009

Solve \(5^{2(x - 1)} \times 5^{x + 1} = 0.04\)

  • A. \(\frac{1}{3}\)
  • B. \(\frac{1}{4}\)
  • C. \(-\frac{1}{5}\)
  • D. \(-\frac{1}{3}\)
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Correct Answer: Option D
Explanation

\(5^{2(x - 1)} \times 5^{x + 1} = 0.04\)

\(5^{2x - 2} \times 5^{x + 1} = 5^{-2}\)

\(2x - 2 + x + 1 = -2\)

\(3x - 1 = -2 \implies 3x = -2 + 1 = -1\)

\(x = -\frac{1}{3}\)

There is an explanation video available below.


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Explanation Video

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WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
WAEC offline past questions - with all answers and explanations in one app - Download for free
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
WAEC offline past questions - with all answers and explanations in one app - Download for free