Beispiel Nr: 10
$(ax+ b)\cdot (ax - b) = a^{2}x^{2} - b^{2} \\ (a + b)\cdot (a - b)\\ \textbf{Gegeben:} \\ (3x + 1\frac{2}{3})(3x - 1\frac{2}{3})\\ \\ \textbf{Rechnung:} \\\text{3. Binomische Formel} \\(3x+1\frac{2}{3})(3x-1\frac{2}{3})=3^{2}x^{2}-1\frac{2}{3}^{2} \\(3x+1\frac{2}{3})(3 x-1\frac{2}{3})= 9x^2-2\frac{7}{9} $