ĐK: \(x\ge-1\).
\(\sqrt[3]{x-2}+\sqrt{x+1}=3\)
\(\Leftrightarrow\sqrt[3]{x-2}-1+\sqrt{x+1}-2=0\)
\(\Leftrightarrow\frac{x-2-1}{\sqrt[3]{\left(x-2\right)^2}+\sqrt[3]{x-2}+1}+\frac{x+1-4}{\sqrt{x+1}+2}=0\)
\(\Leftrightarrow\left(x-3\right)\left(\frac{1}{\sqrt[3]{\left(x-2\right)^2+\sqrt[3]{x-2}+1}}+\frac{1}{\sqrt{x+1}+2}\right)=0\)
\(\Leftrightarrow x-3=0\)
\(\Leftrightarrow x=3\)(thỏa mãn)