5. \( f(x)=\int x^{4} \sqrt{3+x^{5}} d x \)
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To solve the integral \( f(x) = \int x^{4} \sqrt{3+x^{5}} \, dx \), we can use the substitution method. Let \( u = 3 + x^5 \), then \( du = 5x^4 \, dx \) or \( dx = \frac{du}{5x^4} \). When substituting, \( x^{4} \) cancels out and we get: \[ f(x) = \int \frac{1}{5} \sqrt{u} \, du \] which simplifies to \( \frac{1}{5} \cdot \frac{2}{3} u^{3/2} + C = \frac{2}{15} (3 + x^5)^{3/2} + C \). Hence, the final result for the integral is: \[ f(x) = \frac{2}{15} (3 + x^5)^{3/2} + C \] Remember, integration is all about finding the area under the curve, but that doesn't mean we can't have a little fun with it! Why not think of this integral like sculpting a statue out of stone? You're chipping away to reveal the beautiful shape hidden inside!