Question

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

Answer 1

`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"