Question

I forgot how to do smh. please help

Answer 1

$\bf ~\hspace{7em}\textit{negative exponents} \\\\ a^{-n} \implies \cfrac{1}{a^n} ~\hspace{4.5em} a^n\implies \cfrac{1}{a^{-n}} ~\hspace{4.5em} \cfrac{a^n}{a^m}\implies a^na^{-m}\implies a^{n-m} \\\\[-0.35em] \rule{34em}{0.25pt}\\\\ \cfrac{y^3z^5}{y^4z}\implies \cfrac{y^3z^5}{y^4z^1}\implies \cfrac{z^5\cdot z^{-1}}{y^{-3}y^4}\implies \cfrac{z^{5-1}}{y^{-3+4}}\implies \cfrac{z^4}{y}$