1, binomische Formel: (a + b)2 = a2 + 2ab + b2
16+40q+25q2 = 42 + 2*4*5q + (5q)2 = (4 + 5q)2
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2. binomische Formel: (a - b)2 = a2 - 2ab + b2
4x2 - 12xy + 9y2 = (2x)2 - 2 * 2x * 3y + (3y)2 = (2x - 3y)2
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3. binomische Formel: (a + b) • (a - b) = a2 - b2
144a2 - 169b2 = (12a)2 - (13b)2 = (12a + 13b) • (12a - 13 b)
Gruß Wolfgang