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MIANOWNIK MUSI BYC RÓŻNY OD ZERA
x³ -5x²-5x+1≠0
x³+1 -5x(x+1)≠0
(x+1)(x²-x+1) -5x(x+1)≠0
(x+1)(x²-x+1-5x)≠0
(x+1)(x²-6x+1)≠0
x+1≠0 ∧ x²-6x+1≠0
x≠ -1 Δ=36 -4·1·1=36-4=32
√Δ=√32=4√2
x₁≠(6-4√2)/2 = (3-2√2)
x₂≠(6+4√2)/2 = (3+2√2)
D=R\{ -1,(3-2√2), (3+2√2)}
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MIANOWNIK MUSI BYC RÓŻNY OD ZERA
x³ -5x²-5x+1≠0
x³+1 -5x(x+1)≠0
(x+1)(x²-x+1) -5x(x+1)≠0
(x+1)(x²-x+1-5x)≠0
(x+1)(x²-6x+1)≠0
x+1≠0 ∧ x²-6x+1≠0
x≠ -1 Δ=36 -4·1·1=36-4=32
√Δ=√32=4√2
x₁≠(6-4√2)/2 = (3-2√2)
x₂≠(6+4√2)/2 = (3+2√2)
D=R\{ -1,(3-2√2), (3+2√2)}