SOLUTION: Which of the following are roots of the polynomial? How do i find these? x3 - x2 - 5x - 3

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: Which of the following are roots of the polynomial? How do i find these? x3 - x2 - 5x - 3      Log On


   

Question 619213: Which of the following are roots of the polynomial?
How do i find these?
x3 - x2 - 5x - 3
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
Which of the following are roots of the polynomial?
How do i find these?
x3 - x2 - 5x - 3
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Nothing followed.
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Try the integers first, 3 & -3
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f%28x%29+=+x%5E3+-+x%5E2+-+5x+-+3
f%283%29+=+27+-+9+-+15+-+3+=+0
That's one.
Divide x%5E3+-+x%5E2+-+5x+-+3 by (x-3)
--> x%5E2+%2B+2x+%2B+1+=+%28x%2B1%29%5E2
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x = -1, -1, 3