Question

%205%7D%20" id="TexFormula1" title="{x}^{3} {y}^{4} \times {x}^{5} {y}^{ - 5} " alt="{x}^{3} {y}^{4} \times {x}^{5} {y}^{ - 5} " align="absmiddle" class="latex-formula">
pls solve this problem​

Answer 1

$x^3 y^4 \cdot x^5 y^{-5}\\\\=x^{5+3} \cdot y^{4-5}~~~~~~~~~~~~~~~~~~~~~~~;[a^m \cdot a^n = a^{m+n}]\\\\=x^8 y^{-1}\\\\=\dfrac{x^8}{y}~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~;\left[a^{-n} = \dfrac 1{a^n},~~~ a \neq 0\right]$