To solve the equation \( x^2 = \frac{36}{169} \) using inspection, we can take the square root of both sides:
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Take the square root: \[ x = \pm \sqrt{\frac{36}{169}} \]
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Simplify the square root: \[ x = \pm \frac{\sqrt{36}}{\sqrt{169}} = \pm \frac{6}{13} \]
Thus, the complete solution set for the equation \( x^2 = \frac{36}{169} \) is: \[ x = \frac{6}{13} \quad \text{and} \quad x = -\frac{6}{13} \]
The complete solution set is: \[ \left{ \frac{6}{13}, -\frac{6}{13} \right} \]