x³-7x²-34x+40=0
(x-1)(x²-6x-40)=0
(x-1)(x-8,5)(x+3,5)=0
x∈{1, -3,5 8,5}
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x³-7x²-34x+40=0
(x-1)(x²-6x-40)=0
(x-1)(x-8,5)(x+3,5)=0
x∈{1, -3,5 8,5}