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2.(a+b)² - (a-b)²= a²+b²+2ab - (a²+b²-2ab)=a²+b²+2ab -a²-b²+2ab=4ab
3.5(x-3)² + 5x²= 5(x²+9-2×x×(-3)) +5x²=5(x²+9+6x) +5x²=5x²+45+30x+5x²=10x²+30x+45
4.(9x-1)² + (9x-1) (9x+1)= 81x²+1+18x +81x²-1=162x²+18x
5.(7x - 5) (7x +5) - 49x²= 49x²-25-49x²=-25
Jak byś miała jakieś pytanka albo coś to pisz :)