Beispiel Nr: 04
$(ax+ b)\cdot (ax - b) = a^{2}x^{2} - b^{2} \\ (a + b)\cdot (a - b)\\ \textbf{Gegeben:} \\ (1\frac{1}{4}x + \frac{4}{5})(1\frac{1}{4}x - \frac{4}{5})\\ \\ \textbf{Rechnung:} \\\text{3. Binomische Formel} \\(1\frac{1}{4}x+\frac{4}{5})(1\frac{1}{4}x-\frac{4}{5})=1\frac{1}{4}^{2}x^{2}-\frac{4}{5}^{2} \\(1\frac{1}{4}x+\frac{4}{5})(1\frac{1}{4} x-\frac{4}{5})= 1\frac{9}{16}x^2-\frac{16}{25} $