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Let f, left parenthesis, x, right parenthesis, equals, x, start superscript, 3, end superscript, plus, 6, x, start superscript, 2, end superscript, plus, 6, x and let c be the number that satisfies the Mean Value Theorem for f on the interval open bracket, minus, 6, comma, 0, close bracket.
What is c ?
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