Posted by **Math factoring** on Thursday, April 8, 2010 at 10:44am.

Can someone factor this for me?

y=x^4-4x^3+16

i could only get up to:

y=(x-2)(x^3-2x^2-4x-8)

- Mica -
**Reiny**, Thursday, April 8, 2010 at 11:08am
That's as far as you can go using rational numbers

(I ran x^3-2x^2-4x-8 = 0 through my "cubic equation solver and got one messy real root and 2 complex roots)

http://www.1728.com/cubic.htm

- Mica -
**Math factoring**, Thursday, April 8, 2010 at 11:11am
would there be another way to find the x intercepts? Cause thats what i was trying to achieve

- Mica -
**Reiny**, Thursday, April 8, 2010 at 11:16am
you could sketch it and see appr. where it crosses the x-axis.

let f(x) = x^3 - 2x^2 - 4x - 8

If there are any rational factors, then test for

f(x) = 0 using x = ±1, ±2,±4, and ±8

none work, so there are no rational factors.

## Answer this Question

## Related Questions

- Physics - A 550-nm light is incident on a double slit interference arrangements ...
- Physics - A parallel-plate capacitor is made from two aluminum-foil sheets, each...
- PHySics - A 1.63 nF parallel-plate capacitor is charged to an initial potential...
- Algebra - Factor at the greatest common factor from the expression. Can someone ...
- Math -- not "can someone simplify this for me:10x-20 / x-2 " - Repeated ...
- Can someone please help - Can someone show me how to find the sum of this ...
- FACTORING - I can't figure out how to factor this. I know you use the technique ...
- calculus - Factor theorem states that "x-a is a factor of f(x) if and only if f(...
- ALGEBRA - Can someone explain the following to me? 1.How do you factor the ...
- alg 2 - Can someone tell me how to factor 2a^2b - 16ab + 32b Should I factor 2b ...