Question

Which function is a quadratic function

Answer 1

can you type out the choices?

Answer 2

`p(x)=-5x-x^2`

C is correct

Explanation:

Quadratic function: A polynomial whose degree is 2 called quadratic function.

Degree = It is highest power of the polynomial.

We have to check the degree of each option.

Option 1:
`c(x)=6x+3x^3`

Degree = 3

Option 2:
`d(x)=x-8x^4`

Degree = 4

Option 3:
`p(x)=-5x-x^2`

Degree = 2

Option 4:
`k(x)=2x^2+9x^4`

Hence,
`p(x)=-5x-x^2` has degree 2. It would be quadratic function.