Step-by-step explanation:
[tex]8mn[/tex]
or equivalently
[tex]8\cdot m\cdot n[/tex]
We often write variable side-byside without the multiplication sign in algebra. It also applies to terms with indices. For instance,
[tex]\text{We write }a^2b^3c^4\text{ and mean }a^2\times b^3\times c^4[/tex]
We may, often also add a dot at the middle of both terms as another version of multiplication sign for better readability if the terms are more complicated, for instance
[tex]a\cdot b\cdot c[/tex]
and
[tex]\frac ab\cdot \sqrt{\frac{d^4}{b^9}}\cdot\pi[/tex]
