Step 1 :Choose \(u = \ln x\) and \(dv = x^4 dx\)
Step 2 :Calculate \(du = \frac{d(\ln x)}{dx} dx = \frac{1}{x} dx\) and \(v = \int x^4 dx = \frac{x^5}{5}\)
Step 3 :Use integration by parts formula: \(\int x^4 \ln x dx = uv - \int v du\)
Step 4 :Plug in values: \(\int x^4 \ln x dx = \frac{x^5 \ln x}{5} - \int \frac{x^5}{5} \cdot \frac{1}{x} dx\)
Step 5 :Calculate the remaining integral: \(\int \frac{x^5}{5} \cdot \frac{1}{x} dx = \int \frac{x^4}{5} dx = \frac{x^5}{25}\)
Step 6 :Combine terms: \(\int x^4 \ln x dx = \frac{x^5 \ln x}{5} - \frac{x^5}{25} + C\)
Step 7 :\(\boxed{(1 / 5) x^{5} \ln x-(1 / 25) x^{5}+C}\)