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Squaring Property of Square Roots

For any non-negative real number aa, squaring the principal square root of aa returns the original value:

(a)2=a,where a0(\sqrt{a})^2 = a, \quad \text{where } a \geq 0

This property reflects the fact that squaring and taking a square root are inverse operations. When a square root expression is squared, the radical is effectively removed, leaving only the radicand. This relationship is the foundational tool for solving radical equations: by squaring both sides of an equation that contains a square root, the radical is eliminated and the equation is converted into a standard algebraic equation that can be solved with familiar techniques.

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Updated 2026-04-21

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