Question

which represents a quadratic function?f(x) = −8x3 − 16x2 − 4xf (x) = x 2 2x − 5f(x) = 1f(x) = 0x2 − 9x 7

Answer 1

Option 2 is correct.

Explanation:

We have been given three functions:

Quadratic function is the function having degree 2.

Option 1:

`f(x)=-8x^3-16x^2-4x`

Here the highest power or degree of the function is 3

Hence, it is not quadratic.

Option 2:

`f (x)=x^2+2x-5`

Here, the degree of the function is 2.

Hence, quadratic.

Option 3:

f(x)=1

There is no degree since, no variable

Hence, not quadratic.

Option 4:

`f(x)=0x^2-9x^7`

Here, degree of the function is 7

Hence, not quadratic.