SOLUTION: Find the roots of y=x^9-x^7-8x^6-16x^5+8x^4+16x^3+128x^2-128

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Question 189959This question is from textbook saxon algebra 2
: Find the roots of y=x^9-x^7-8x^6-16x^5+8x^4+16x^3+128x^2-128
This question is from textbook saxon algebra 2

Answer by stanbon(48568) About Me  (Show Source):
You can put this solution on YOUR website!
Find the roots of y=x^9-x^7-8x^6-16x^5+8x^4+16x^3+128x^2-128
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Since the coefficients add up to zero, x=1 is a root.
Use synthetic division to find other roots:
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1)....1....0....-1....-8....-16....8....16....128....0....-128
.......1.....1....0.....-8....-24...-16...0.....128...128..|..0
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I graphed the equation and found that x=1 is the only Real Number zero.
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Cheers,
Stan H.