Use Descartes' Rule of Signs to state the possible number of positive, real, negative real, and imaginary roots for each function.

1. f(x)= 2x^4 - 3x^3 + 7x^2 - 8x +9

2. f(x)= 2x^3 + 4x^2 - 7x - 8

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1+1+1+1

4,2 or 0 positive roots

1. f(x)= 2x^4 + 3x^3 + 7x^2 + 8x +9

0 negative roots

1 positive root

2. f(x)= -2x^3 + 4x^2 + 7x - 8

2

2 or 0 negative roots

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