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Solve the poloynomial
x^3+4x^2-x-4=0
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x^3+4x^2-x-4=0
use grouping
x^2(x+4) - (x+4) = 0
(x+4)(x^2 - 1) = 0
(x+4)(x+1)(x-1) = 0
x = -4, ± 1
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