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finding roots, minima, maxima using excel solver

The excel solver works for some functions but does not work for other simple functions. For example, f(x) = SQRT(A1^3-1), excel solver does not find roots. But other similar function works for example f(x) = A3^3-SQRT(A3)-1. Do you see any problem with the first function? Is it supposed to be expressed differently?

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