SOLUTION: Find the zeros of the polynomial x^5-6x^4+9x^3. Enter your answers in increasing order. Enter “none” in all entry areas if there are no zeros.

Algebra ->  Finance -> SOLUTION: Find the zeros of the polynomial x^5-6x^4+9x^3. Enter your answers in increasing order. Enter “none” in all entry areas if there are no zeros.      Log On


   



Question 1014681: Find the zeros of the polynomial x^5-6x^4+9x^3.
Enter your answers in increasing order. Enter “none” in all entry areas if there are no zeros.

Answer by ikleyn(52785) About Me  (Show Source):
You can put this solution on YOUR website!
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Find the zeros of the polynomial x^5-6x^4+9x^3.
Enter your answers in increasing order. Enter “none” in all entry areas if there are no zeros.
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Factor out x%5E3:

x%5E5-6x%5E4%2B9x%5E3 = x%5E3%2A%28x%5E2-6x%2B9%29.

Now solve this polynomial equation:

x%5E3%2A%28x%5E2-6x%2B9%29 = 0.

Its 3 roots are x = 0 of multiplicity 3.

Next you need to solve this quadratic equation 

x%5E2-6x%2B9 = 0.

Notice that the left side is %28x-3%29%5E2.

So, your equation is 

%28x-3%29%5E2 = 0.

It has the root x = 3 of multiplicity 2.

Answer. The roots are x=0 of multiplicity 3 and x=3 of multiplicity 2.