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April 20, 2014

April 20, 2014

Posted by **Josh** on Monday, November 21, 2011 at 1:27am.

2. Find the polynomial with leading coefficient 1 that has a degree of 4, a zero of multiplicity 2 at x=1 and a zero at x=2+i

- Pre Calculus -
**Steve**, Monday, November 21, 2011 at 5:01amWe see right off that x=0 is a root.

Any rational roots must have a numerator which divides 3, and a denominator which divides 3. So, try 3,1,1/3

Then we have x(x-1)(3x^2 - 8x + 3)

The quadratic formula reveals the other two roots:

4/3 +/- √7/3

_____________________

If 2+i is a root, so is 2-i, so x^2 -4x + 5 is a factor.

So, f(x) = (x-1)(x-1)(x^2 - 4x + 5)

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