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Problem

Let h, left parenthesis, x, right parenthesis, equals, 2, x, start superscript, 3, end superscript, plus, 3, x, start superscript, 2, end superscript, minus, 12, x.
What is the absolute minimum value of h over the closed interval minus, 3, is less than or equal to, x, is less than or equal to, 3?
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