Question

Use descartes rule of signs: 5x^5-2x^3-x^2+1

Answer 1

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Answer 2

descartes sign rule eh; i cant remember if the zero spots count, gonna have to refersh that memory cell

Answer 3

ignore the zero spots...

Answer 4

convert to f(-x) and repeat

Answer 5

which pretty much means reverse the odd power signs

Answer 6

-5x^5+2x^3-x^2+1

+-+ 3 negative roots posible

Answer 7

2 possible +roots

Answer 8

one actual root at -0.765023
A small scale plot is attached.