Determine what Descartes' Rule of Signs says about the number of positive and negative real roots for the polynomial function. P(x)=8x^3+2x^2-14x+5

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step-by-step explanation:

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f(x) = - 2/3x + 5; f(5/2)

substitute 5/2 in for x:

f(5/2) = -2/3(5/2) + 5

simplify the right side:

f(5/2) = -5/3 + 5

f(5/2) = 10/3

answer:

f(5/2) = 10/3

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