The answer will depend on the exact nature of the equation.
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The property that is essential to solving radical equations is being able to do the opposite function to the radical and to the other side of the equation. This allows you to solve for the variable. For example, sqrt (x) = 125.11 [sqrt (x)]2 = (125.11)2 x = 15652.5121
36
Yes, that is correct. It is one of the basic properties of surds, and is used in many identities and some equations, to simplify and calulate and prove.
The square root of 64 is 8 and you can work it out using the square root algorithm.
You can solve this in two steps: 1) Calculate the square root with a calculator. 2) Compare.