Resposta :
[tex]8\sqrt{x^{3}}+\sqrt{x^{3}}
\\\\
8\sqrt{x^{3}}+1\sqrt{x^{3}} = 9\sqrt{x^{3}}[/tex]
[tex]9\sqrt{x^{3}} = 9\sqrt{x^{2} \cdot x} = 9 \cdot x \sqrt{x} = \boxed{\boxed{9x\sqrt{x}}}[/tex]
[tex]9\sqrt{x^{3}} = 9\sqrt{x^{2} \cdot x} = 9 \cdot x \sqrt{x} = \boxed{\boxed{9x\sqrt{x}}}[/tex]