## Precalculus: Mathematics for Calculus, 7th Edition

$$f(2x) = 6x-1$$ $$2f(x) = 6x-2$$
For x = 2x $f(2x) = 3(2x) - 1$ ... multiply $=6x - 1$ ________________ $f(x) = 3x - 1$ therefore $2f(x) = 2(3x-1)$ ... multiply $=6x - 2$