By looking at the degree of the polynomials, we conclude that the option that is not linear is option C.
<h3>Which of the following functions is not a linear function?</h3>
A polynomial is an expression of the form:
![p(x) = a_n*x^n + a_{n-1}*x^{n-1} + ... + a_0](https://tex.z-dn.net/?f=p%28x%29%20%3D%20a_n%2Ax%5En%20%2B%20a_%7Bn-1%7D%2Ax%5E%7Bn-1%7D%20%2B%20...%20%2B%20a_0)
Where all the exponents are natural numbers.
We define the degree of a polynomial as the largest exponent, and we define a linear function as a polynomial of degree 1.
So a linear function is of the form:
![f(x) = a_1*x + a_0](https://tex.z-dn.net/?f=f%28x%29%20%3D%20a_1%2Ax%20%2B%20a_0)
Now, if you look at option C, you can see that the degree of that polynomial is 2. So that is not a linear function.
Then the correct option is C.
If you want to learn more about linear equations:
brainly.com/question/1884491
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