[tex] (a^{4} .b ^{ - 3})^{7} = a^{4.7}.b^{-3.7} = a^{28}.b^{-21} = \dfrac{a^{28}}{b^{21}} [/tex]
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[tex] (a^{4} .b ^{ - 3})^{7} = a^{4.7}.b^{-3.7} = a^{28}.b^{-21} = \dfrac{a^{28}}{b^{21}} [/tex]