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January 25, 2015

January 25, 2015

Posted by **kristie** on Wednesday, July 26, 2006 at 12:08pm.

y= x^4+2x^3+4x^2+8x+16

Not in the real number system. If you plot the function, you will see the minimum is at x=-1.1 (approx) and y is positive. At no x does the function equal zero, so there are no real roots, which means, no factors.

You can do some moving around..

x^4+2x^3+4x^2+8x+16

x^3(x + 2) + 4x(x + 2) + 16

(x+2)(x^3+ 4x) + 16

x(x +2)(x^2+4) + 16

I dont personally see that as progress.

Not having real roots doesn't mean it can't be factored: x^4+2x^2+1=(x^2+1)^2 has no real roots, but it does factor.

In theory every polynomial over R factors as polynomials of degree 1 or 2, but finding the factors can be time consuming in practice.

True.

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