There is no "general" equation. The square root of a number (or expression) is simply sqrt(x) or x1/2, where x is a number or an expression.
In more basic mathematics, x must be non-negative but, once you start studying complex numbers, that is no longer a requirement.
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What square root property is essential to solve any radical equation involving square root?
square
Technically,no. A radical equation has a radical (Square root) in it, and has two solutions because the square root can be positive or negative.
The general quadratic equation is ax2 + bx + c = 0 The two solutions are: x = [ (negative b) plus or minus the square root of (b2 - 4ac) ] all divided by (2a).
The roots are (if the equation is of the form Ax2 + Bx + C = 0 ((-B) + Square Root of (B2 - 4xAxC)) / 2xA and ((-B) - Square Root of (B2 - 4xAxC)) / 2xA