square both sides of inequality?

When is Squaring Both Sides of an Inequality Okay?

(Figure 1) Hence squaring both sides of an inequality will be valid as long as both sides are non-negative. Since square roots are non-negative, inequality (2) is only meaningful if both sides are non-negative. Hence, squaring both sides was indeed valid.

4.Basic Mathematics – Squaring both sides in Inequalities (JEE Main and Advanced)

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