rozłóż wilelomian w(x)= x^5-14x^3+45x na czynniki stopnia możliwie najniższego
W(x)=x⁵-14x³+45x
W(x)=x(x⁴-14x²+45)
Niech x²=t
t²-14t+45=0
Δ=(-14)²-4·1·45=196-180=16
√Δ=4
t₁=(4+14)/2=9
t₂=(-4+14)/2=5
W(x)=x(x²-9)(x²-5)
W(x)=x(x+3)(x-3)(x+√5)(x-√5)
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W(x)=x⁵-14x³+45x
W(x)=x(x⁴-14x²+45)
Niech x²=t
t²-14t+45=0
Δ=(-14)²-4·1·45=196-180=16
√Δ=4
t₁=(4+14)/2=9
t₂=(-4+14)/2=5
W(x)=x(x²-9)(x²-5)
W(x)=x(x+3)(x-3)(x+√5)(x-√5)