There are different answers for different expressions but essentially, you can either evaluate the expression and then find the square root using a calculator, computer or numerical methods, or you can work out the square root algebraically.
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Press the square root button on your calculator.
The square root of 1225 is 35.
square root(105) = 10.2469508
The square root of 8649 is 93.
The square root of 289 is ± 17.