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If \(\frac{1}{5^{-y}} = 25(5^{4-2y})\), find the value of y.

Further Mathematics
WAEC 2014

If \(\frac{1}{5^{-y}} = 25(5^{4-2y})\), find the value of y.

  • A. 4
  • B. 2
  • C. -4
  • D. -5
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Correct Answer: Option B
Explanation

\(\frac{1}{5^{-y}} = 25(5^{4-2y})\)

\(\implies 5^{y} = (5^{2})(5^{4-2y})\)

\(5^{y} = 5^{2+4-2y}\)

Comparing bases, we have

\(y = 6 - 2y\)

\(3y = 6 \implies y = 2\)


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