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7th Class Mathematics Exponents and Power Question Bank Exponents and Powers

  • question_answer
    Solve \[{{9}^{4x}}\div {{3}^{2x}}=2187\].

    A)  \[x=\frac{6}{7}\]             

    B)        \[x=\frac{-7}{6}\]

    C)  \[x=\frac{7}{6}\]               

    D)         \[x=\frac{-6}{7}\]

    Correct Answer: C

    Solution :

     \[{{9}^{4x}}\div {{3}^{2x}}=2187\]\[\Rightarrow \] \[6x=7\] \[\Rightarrow \]  \[x=\frac{7}{6}\]


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