check my precalc
posted by Rebekah .
Rewrite each of the following as a product of linear factors
1. x^2+3
My Answer: (x+iroot 3)(xiroot3)
2. x^22x+3
MA: (x(1+iroot2))(x(1iroot2))
3. x^4+x
MA: IM not sure how to do it! can you help?
4. x^5x^4+5x^3
MA: x^3(x(1+iroot19/2))(x(1iroot19/2))
5. 3x^2+7
MA: NOT sure how to do
6. x^6+3x^510x^44x^212x+40
MA: (x2)(x+5)(x+iroot2)(xiroot2)(x+root2) (xroot2)
THANKS SO MUCH!!!

3. I don't see linear factors coming out of this.
5. (xsqrt4+isqrt7)(xsqrt3isqrt7) 
thanks
are all the others correct?