SOLUTION: Why is it sufficient to define a quadratic function, in terms of a, b, and c?

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Question 147: Why is it sufficient to define a quadratic function, in terms of a, b, and c?
Answer by ichudov(499) About Me  (Show Source):
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A quadratic function is a sum of three terms, a term with x%5E2, a term with x, and a constant. A, b and c are coefficients for these terms. There are no more terms, so a, b and c are enough.