ĐKXĐ: \(x\ge-3\)
\(x^4\sqrt{x+3}-2x^4+2019x-2019=0\)
\(\Leftrightarrow x^4\left(\sqrt{x+3}-2\right)+2019\left(x-1\right)=0\)
\(\Leftrightarrow x^4\left(\frac{x-1}{\sqrt{x+3}+2}\right)+2019\left(x-1\right)=0\)
\(\Leftrightarrow\left(x-1\right)\left(\frac{x^4}{\sqrt{x+3}+2}+2019\right)=0\)
\(\Leftrightarrow x-1=0\) (ngoặc phía sau luôn dương)
\(\Rightarrow x=1\)