Posted by **greeny** on Thursday, July 26, 2012 at 11:26pm.

Using the given zero, find all the zeroes and write a linear factorization of f(x)

1 + i is a zero of f(x)= x4-2x^3-x^2 + 6x -6

I did synthetic division and I got that it wasnt a zero?

- math- finding zeros -
**MathMate**, Thursday, July 26, 2012 at 11:40pm
This is a trick question.

We know that complex roots always come in pairs. If 1+i is a root, so is 1-i, its conjugate.

The given root and its conjugate multiplied together become a real factor, namely (x-1-i)(x-1+i)=x^2-2*x+2.

Repeat your synthetic division using the combined real factor and you will have a quotient of x²-3.

- math- finding zeros -
**greeny**, Friday, July 27, 2012 at 12:06am
oh yeah, I forgot about the conjugates! thanks!

One more question, how do i divide x^4-2x^3-x^2+6x-6 by x^2-2x+2 using synthetic division?

- math- finding zeros -
**MathMate**, Friday, July 27, 2012 at 6:34am
It's a similar process as long division with numbers.

Check out web resources such as:

http://www.purplemath.com/modules/synthdiv2.htm

or

http://www.youtube.com/watch?v=bZoMz1Cy1T4

## Answer this Question

## Related Questions

- Pre Calc - I am familiar with this type of problem but can't seem to get the ...
- Pre Calc (For Reiny) - Thanks so much your method worked perfectly! My solution ...
- Algebra2/Trig - Find all the zeros of the function and write the polynomial as a...
- College Algebra - Find all the zeros of the polynomial function by using the ...
- Precalc - Hello, good afternoon. I need help with my precalc hw. we are learning...
- Algebra 2 help please :) - What is a cubic polynomial function in standard form ...
- Math - Q.1)If one zero of the polynomial 3x2-kx-2 is 2 find the other zero.allso...
- Algebra - The book said to replace the x with a zero. Why are two zero's used in...
- algebra - p(x)=x^3+2x^2-3x+20 one of this functions zeros is -4 When using ...
- Algebra - please help me with this question and check my answers. Solve the ...

More Related Questions