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

  • question_answer
    The number which is multiplied by \[{{(-8)}^{-1}}\]to obtain a product equal to \[{{10}^{-1}}\] is ____.

    A)  \[-\frac{4}{5}\]                                 

    B)  \[-\frac{3}{5}\]                     

    C)  \[-\frac{1}{5}\]         

    D)         \[-\frac{5}{4}\]         

    Correct Answer: A

    Solution :

    Let the number be x, Then, \[{{(-8)}^{-1}}\times x={{(10)}^{-1}}\] \[\Rightarrow \]\[\left( \frac{-1}{8} \right)\times x=\left( \frac{1}{10} \right)\Rightarrow x=\frac{-4}{5}\]


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