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Always remember that : \(\frac{a^b}{a^c} = a^{b-c} \)

Hence, \[\large{\frac{4^{21}}{4^7} = 4^{21-7} = 4^{14}}\]

Addition.........

Simplify 15^4
----
15^5

Do subtraction.. :)

Simplify 15^4 ---- 15^5

wouldnt it be 15^-9??? not a answer

its 15^-4 and 15^5

Do subtraction like this....\[\frac{15^4}{15^5}=15^{4-5}=15^{-1}\]

This answer is for the one you typed before..

Addition

\[15^{(4-5)}\]

\[\frac{15^{-4}}{15^5}=15^{-4-5}=15^{-9}\]