Uzasadnij, że jeśli to ad=bc
a²c² + a²d² + b²c² + b²d² = a²c² + 2ac bd + b²d²
a²d² + b²c² = 2ac bd
a²d² - 2ac bd + b²c² = 0
(ad - bc)² = 0
ad - bc = 0
ad = bc
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a²c² + a²d² + b²c² + b²d² = a²c² + 2ac bd + b²d²
a²d² + b²c² = 2ac bd
a²d² - 2ac bd + b²c² = 0
(ad - bc)² = 0
ad - bc = 0
ad = bc