# Chapter 2 - Real Numbers - 2.4 - Exponents - Problem Set 2.4 - Page 76: 81

$= \frac{5-7x^{2}}{x^{4}}$

#### Work Step by Step

1) Multiply a fraction with the other denominator to obtain a common denominator between the two fractions. In this case, we only need to multiply the second fraction by $x^{2}/x^{2}$ 2) Subtract $= \frac{5}{x^{4}} - \frac{7}{x^{2}}$ $= \frac{5}{x^{4}} - \frac{7x^{2}}{x^{4}}$ $= \frac{5-7x^{2}}{x^{4}}$

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