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x^{2}\geq \left(2\sqrt{10}\right)^{2}
Calcula l'arrel quadrada de 40 i obté 2\sqrt{10}. Reescriviu 40 com a \left(2\sqrt{10}\right)^{2}.
|x|\geq 2\sqrt{10}
La desigualtat es manté per a |x|\geq 2\sqrt{10}.
x\leq -2\sqrt{10}\text{; }x\geq 2\sqrt{10}
Reescriviu |x|\geq 2\sqrt{10} com a x\leq -2\sqrt{10}\text{; }x\geq 2\sqrt{10}.