![f(x)=2x^2-4x+1](https://tex.z-dn.net/?f=f%28x%29%3D2x%5E2-4x%2B1)
Substitute the values of x to the equation of the function f:
![x=-1\to f(-1)=2(-1)^2-4(-1)+1=2(1)+4+1=7\\\\x=2\to f(2)=2(2^2)-4(2)+1=2(4)-8+1=1](https://tex.z-dn.net/?f=x%3D-1%5Cto%20f%28-1%29%3D2%28-1%29%5E2-4%28-1%29%2B1%3D2%281%29%2B4%2B1%3D7%5C%5C%5C%5Cx%3D2%5Cto%20f%282%29%3D2%282%5E2%29-4%282%29%2B1%3D2%284%29-8%2B1%3D1)
Therefore we have two points (-1, 7) and (2, 1).
We can calculate the slope of line l.
The formula of a slope:
![m=\dfrac{y_2-y_1}{x_2-x_1}](https://tex.z-dn.net/?f=m%3D%5Cdfrac%7By_2-y_1%7D%7Bx_2-x_1%7D)
Substitute:
![m=\dfrac{1-7}{2-(-1)}=\dfrac{-6}{3}=-2](https://tex.z-dn.net/?f=m%3D%5Cdfrac%7B1-7%7D%7B2-%28-1%29%7D%3D%5Cdfrac%7B-6%7D%7B3%7D%3D-2)
<h3>Answer: A) -2.</h3>
34 im pretty sure
i have to use 20 characters so i am typing this
I think it is 50.49, IDK what answer you are searching for