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x²=16
x₁=4
x₂=-4
b]
(x-1)(x-3)(x-5)=0
x₁=1
x₂=3
x₃=5
c]x⁴=1
x₁=1
x₂=-1
2]
a]x(x-1)(x-2)=0
x₁=0
x₂=1
x₃=2
wszystkie, oprócz 3
e]x²+8=6x
x²-6x+8=0
Δ=b²-4ac=36-32=4
√Δ=2
x₁=(-b-√Δ):2a=(6-2):2=2
x₂=(6+2):2=4
to liczby:2 i 4