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delta=25-4*1*6=25-24=1
x1=5+1/2=3
x1=5-1/2=2
x∈(-∞,2)i(3,+∞)
√x²-5x +6≠0
√x²-5x ≠-6
x²-5x=36
x²-5x-36=0
delta=25-4*1*(-36)=25+144=169
√delta=13
x1=5+13/2=9
x2=5-13/2=-4
czyli dziedzina=(-∞,-4)i(-4,2)i(3,9)i(9,+∞)
0=√x²-17 -8
8=√x²-17
64=x²-17
x²2=81
x=9 lub x=-9 ===> miejsca zerowe
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