Is u(x) = –x + 3x2 – 8 a quadratic function

Step-by-step explanation:

A quadratic function is a polynomial in which the highest degree of its exponent is a 2, and it is in one variable only. So, yes, this is a quadratic, although it is not in descending form. Standard form for this would be

the solution, from the graphing of the two lines, is (3,2), i.e., x = 3, y = 2.

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