Which function is a quadratic function? c(x) = 6x + 3x3 d(x) = x – 8x4 p(x) = –5x – x2 k(x) = 2x2 + 9x4

easy
quadratic means 2nd degree

means highest power of exponent is 2
so like x^2

first one
we have 3x^3, that is 3rd degree,nope

2nd one
we have 8x^4, nope, that is 4th degree

3rd one
we have -x^2, yep

4th one, we have 9x^4, that is 4th degree

answer is 3rd one or p(x)=-5x-x^2

Answer Link

CintiaSalazar CintiaSalazar · Answer 2 · 2022-07-15T12:13:15+02:00

Considering the definition of cuadratic function, P(x)=-5x-x² is a cuadratic function

Quadratic function

A quadratic function is a type of function that is characterized by being a second degree polynomial.

The form of a quadratic function is f(x) = ax² + bx + c, where a≠0. This way of writing the function is called the general form.

The graph of a quadratic function is a parabola, a type of 2-dimensional curve symmetric with the vertical axis.

The sign of the element containing the degree indicates whether it is a convex or concave function:

If the sign is positive → the function will have a minimum at X, and therefore it will be concave.
If the sign is negative → the function will have a maximum at X, and therefore it will be convex.

This case

P(x)=-5x-x² is a cuadratic function, where c= 0, b= -5 and a=-1.

Learn more about a quadratic function:

https://brainly.com/question/27926671

https://brainly.com/question/3813569

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