a)
x=1
x=2 nie
x=3
b)
x=1 nie
c)
x=1 (x-1)(x+1) = x2-1 (wzór skróconego mnożenia czyli lewa strona też x2-1
x=2
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a)
x=1![1^{2} +3 =4 *1\\4=4 1^{2} +3 =4 *1\\4=4](https://tex.z-dn.net/?f=1%5E%7B2%7D%20%2B3%20%3D4%20%2A1%5C%5C4%3D4)
x=2
nie
x=3![3^{2} +3= 4*3\\12 =12 3^{2} +3= 4*3\\12 =12](https://tex.z-dn.net/?f=3%5E%7B2%7D%20%2B3%3D%204%2A3%5C%5C12%20%3D12)
b)
x=1
nie
x=2
nie
x=3![3^{2} -1 =8\\9-1=8\\8=8 3^{2} -1 =8\\9-1=8\\8=8](https://tex.z-dn.net/?f=3%5E%7B2%7D%20-1%20%3D8%5C%5C9-1%3D8%5C%5C8%3D8)
c)
x=1 (x-1)(x+1) = x2-1 (wzór skróconego mnożenia czyli lewa strona też x2-1
x=2![2^{2} -1= 2^{2} -1\\3=3 2^{2} -1= 2^{2} -1\\3=3](https://tex.z-dn.net/?f=2%5E%7B2%7D%20-1%3D%202%5E%7B2%7D%20-1%5C%5C3%3D3)
x=3![3^{2} -1= 3^{2} -1\\8=8 3^{2} -1= 3^{2} -1\\8=8](https://tex.z-dn.net/?f=3%5E%7B2%7D%20-1%3D%203%5E%7B2%7D%20-1%5C%5C8%3D8)