Find m in Exponent Equation

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Q. \( \left[\{(1/7^2)^{-2}\}^{-\frac{1}{3}}\right]^{\frac{1}{4}} = 7^m \)
(a) \( -\frac{1}{3} \)    (b) \( \frac{1}{4} \)    (c) -3    (d) 2

✏️ Solution

\( \frac{1}{7^2} = 7^{-2} \)

\( (7^{-2})^{-2} = 7^{4} \)

\( (7^{4})^{-1/3} = 7^{-4/3} \)

\( (7^{-4/3})^{1/4} = 7^{-4/12} \)

\( = 7^{-1/3} \)

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

Correct Option: (a) \( -\frac{1}{3} \)

\( \boxed{-\frac{1}{3}} \)

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