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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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 or 0 negative roots
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