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  • 2021 December(E23) Math Question 21

    Exponents, Radicals, & Scientific Notation

    - Exponent Expressions

    Laws of exponents
    Choice A
    −{1}{81}=−3x-\frac\{1\}\{81\}=-3^x−1{​}{81}=−3x
    −{1}{(3)4}=−3x-\frac\{1\}\{(3)^4\}=-3^x−1{​}{(3)4}=−3x
    −(3){−4}=−3x-(3)^\{-4\}=-3^x−(3){−4}=−3x
    ∴x=4\therefore x=4∴x=4

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