Solve the equation by extracting square roots. When a solution is irrational, list both the exact solution

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Solve the equation by extracting square roots. When a solution is irrational, list both the exact solution and its approximation rounded to two decimal places.
1. x2 = 49
2. x2 = 144
3. x2 = 19
4. x2 = 43
5. 3x2 = 81
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