Lösung 4.1:7d
Aus Online Mathematik Brückenkurs 1
We rewrite the equation in standard form by completing the square for the x- and y-terms,
Now, the equation is
The only point which satisfies this equation is \displaystyle (x,y) = (1,-1) because, for all other values of x and y, the left-hand side is strictly positive and therefore not zero.
