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NArgMin

Numerical arg min.

$ wo 'NArgMin[x^2 + 3x + 1, x]'
-1.5

With constraints it reports where the optimum sits — one value for a single variable, a list for several:

$ wo '{NArgMin[{-x, x <= 5}, x], NArgMin[{x^2 + y^2, x + y == 2}, {x, y}]}'
{5., {1., 1.}}

$ wo 'NArgMin[x^2 + y^2, {x, y}]'
{0., 0.}