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a)
x²-11=(x-√11)(x+√11)
b)
x²-2=(x-√2)(x+√2)
c)
x²-9=(x-3)(x+3)
d)
x²-3=(x-√3)(x+√3)
e)
x²-4=(x-2)(x+2)
x=√11 lub x=-√11
b) x²=2
x=√2 lub x=-√2
c) x²=9
x=3 lub x=-3
d) x²=3
x=√3 lub x=-√3
e) x²=4
x=2 lub x=-2