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check my precalc

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Rewrite each of the following as a product of linear factors
1. x^2+3
My Answer: (x+iroot 3)(x-iroot3)
2. x^2-2x+3
MA: (x-(1+iroot2))(x-(1-iroot2))
3. x^4+x
MA: IM not sure how to do it! can you help?
4. x^5-x^4+5x^3
MA: x^3(x-(1+iroot19/2))(x-(1-iroot19/2))
5. 3x^2+7
MA: NOT sure how to do
6. x^6+3x^5-10x^4-4x^2-12x+40
MA: (x-2)(x+5)(x+iroot2)(x-iroot2)(x+root2) (x-root2)


  • check my precalc - ,

    3. I don't see linear factors coming out of this.
    5. (xsqrt4+isqrt7)(xsqrt3-isqrt7)

  • check my precalc - ,

    are all the others correct?

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