Appendix A - A Exercises - Page A6: 45

$$\frac{3}{\sqrt{x}}-\frac{5x^2}{\sqrt{x}}-\frac{x^4}{\sqrt{x}}$$

We can split each component in the numerator up by making separate fractions, all with the same denominator. Thus, we find: $$\frac{3}{\sqrt{x}}-\frac{5x^2}{\sqrt{x}}-\frac{x^4}{\sqrt{x}}$$