A marshy region used for agricultural drainage has become contaminated with selenium. It has been determined that flushing the area with clean water will reduce the selenium for a while, but it will then begin to build up again. A biologist has found that the percent of selenium in the soil x months after the flushing begins is given by

When will the selenium be reduced to a minimum? What is the minimum percent?

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f(x) = = x² + 36 2x 1 ≤ x ≤ 12.