Ooo you're a bit off there .. We'll have to read through this carefully.
It says the function f(x) passes through the point (2, 19). This means that (2,19) is part of the graph, i.e. if you plug in 2 into the equation of the graph f(x) you will get 19:
It also says that the function f(x) has a horizontal tangent. Think about what this means. A horizontal line has a slope = 0 and remember that a derivative essentially represents the slope of a curve. So, we know that at x = -1, f'(x) = 0:
Plugging x = -1:
Also, it gives us another point of the graph (-1, -8) indicating that:
Now, note all the coloured equations. You'll now have to solve this system of equations Luckily, you have the blue equation to simplify your system into one involving only 2 variables