Is y = x^3 − 3x − 20 a quadratic function?

1 Answer
Alan P.
Aug 5, 2015

y=x^3 -3x-20 is a cubic function
It is not a quadratic

Explanation:

A quadratic function must have the form:
color(white)("XXXX")y=ax^2+bx+c
Note that the highest degree of the variable x is 2

A function of the form:
color(white)("XXXX")y=ax^3+bx^2+cx+d
color(white)("XXXX")(with the highest degree of x being 3)
is called a "cubic function"

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