Please factorize fully, the following polynomials, who can help me?

Dear Hahahaha,

x^(3)+x^(2)-x-10

Factor the polynomial using the rational roots theorem.
(x-2)(x^(2)+3x+5)
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x^(4)-3x^(2)-6x+8

Factor the polynomial using the rational roots theorem.
(x-2)(x^(2)+3x+4)
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it is factor