Help math question 10 points best answer
Favorites|Homepage
Subscriptions | sitemap
HOME > > Help math question 10 points best answer

Help math question 10 points best answer

[From: ] [author: ] [Date: 11-11-29] [Hit: ]
Thank you so much toeveryone who responds.since they all have at least x^3 in them, lets factor them out and see what we get.Now x^2 - x - 2 looks much easier to factor eh?Thus,Thus,......
The problem that I have is I need help with following

I need to find the all roots for the following:

y= x to the fifth minus x to the fourth minus 2x cubed

I had two choices:

to subtract x to the 4th from x to the 5th , and get x-2x cubed.

or other choice I had is to distrubite to get x cubed and in parathesis xsquared minus x minus 2.

Please help solve this problem, because I am doing something way wrong.

Thank you so much toeveryone who responds. Thank you x 10000000000
Happy Holidays

-
y = x^5 - x^4 - 2x^3

since they all have at least x^3 in them, lets factor them out and see what we get.

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

Now x^2 - x - 2 looks much easier to factor eh?
y = x^3(x^2 - 2x + x - 2)
y = x^3(x(x - 2) + (x - 2))
y = x^3(x + 1)(x - 2)

Thus, when you equate that nice factored form to zero:

x^3(x + 1)(x - 2) = 0
x^3 = 0
x = 0
OR
x + 1 = 0
x = -1
OR
x - 2 = 0
x = 2

Thus, x = -1, 0, 2

Hope this helps :D
1
keywords: best,answer,Help,points,math,10,question,Help math question 10 points best answer
New
Hot
© 2008-2010 http://www.science-mathematics.com . Program by zplan cms. Theme by wukong .