Lösung 2.3:5b
Aus Online Mathematik Brückenkurs 1
Instead of randomly trying different values of x, it is better investigate the second-degree expression by completing the square,
In the expression in which the square has been completed, we see that if, e.g. \displaystyle x=7/2, then the whole expression is negative and equal to -1.
Note: All values of x between 3 and 4 give a negative value for the expression.
