Answer:
7 1/2
Step-by-step explanation:
f(3) = 2
To evaluate f(3), substitute x = 3 into f(x), that is
f(3) = - 2(3) + 8 = - 6 + 8 = 2
![y=\sqrt[]{\frac{x+4}{2} }](https://tex.z-dn.net/?f=y%3D%5Csqrt%5B%5D%7B%5Cfrac%7Bx%2B4%7D%7B2%7D%20%7D)
![y=2x^2-4\\x=2y^2-4\\x+4=2y^2\\\frac{x+4}{2}=y^2\\ y=\sqrt[]{\frac{x+4}{2} }](https://tex.z-dn.net/?f=y%3D2x%5E2-4%5C%5Cx%3D2y%5E2-4%5C%5Cx%2B4%3D2y%5E2%5C%5C%5Cfrac%7Bx%2B4%7D%7B2%7D%3Dy%5E2%5C%5C%20y%3D%5Csqrt%5B%5D%7B%5Cfrac%7Bx%2B4%7D%7B2%7D%20%7D)
