When we solve extrema problems we always search for extreme values, like the maximum or minimum value of a function.
- A function of the first degree represents a line.
When this function increases (rico > 0) the maximum value will be found in +INF.
When the function is declining, the maximum can be found in -INF.
- A function of the second degree represents a parabola.
We can calculate the top of the function in two different ways:
- ((-b/2a), f(-b/2a)) with f(x)= ax˛+bx+c
- Differentiate the function and equal this to 0.
When solving exercises where we need to find extreme values, you have to construct a function and then you have to calculate the minimum or maximum values.