Question
Solve: $\frac{50}{(\text{x})^2}-\frac{2\text{x}^2}{81}$
✓
Answer
$\frac{50}{(\text{x})^2}-\frac{2\text{x}^2}{81}$ $=2\Big(\frac{25}{(\text{x})^2}-\frac{\text{x}^2}{81}\Big)$ $=2\Big\{\frac{25}{(\text{x})^2}-\frac{2\text{x}^2}{81}\Big\}$ $=2\Big(\frac{5}{\text{x}}-\frac{\text{x}}{9}\Big)\Big(\frac{5}{\text{x}}+\frac{\text{x}}{9}\Big)$
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