(B) \( \frac{2 x d x}{x^{4}-5} \)
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To solve the integral \( \int \frac{2x \, dx}{x^4 - 5} \), one key step is to use substitution. Notice that the denominator is a function of \( x^4 \). By letting \( u = x^4 - 5 \), then \( du = 4x^3 \, dx \), which indicates that we might need to manipulate the integral further with appropriate adjustments. After some algebra, you'll find that you can express the original integral in terms of \( u \). Don't forget to balance your substitution properly when reintroducing \( dx \) through \( du \). Eventually, the result will involve a natural logarithm function structured in terms of \( u \) again. This is a classical approach seen in integration involving polynomials in the denominator. To practice, try evaluating the integral using this substitution and see how it simplifies! There’s nothing like hands-on practice to solidify your understanding of integration techniques.