Binomische Formeln
1. binomische Formel: (a + b) ² = (a+b) * (a+b)
= a*a +a*b+b*a+b*b
= a² +ab+ab+b²
= a²+2ab+b²
2. binomische Formel: (a-b)² = (a-b)*(a-b)
= a*a-b*a-a*b+b*b
= a²ab-ab+b²
=a²-2ab+b²
3. binomische Formel: (a+b)*(a-b)
= a*a+b*a-b*a-b*b
=a² -b²