Question: In Example 4, change all signs between terms. (Leave the first term positive.) Data from Example 4 For the equation 4x 5 x 4

In Example 4, change all signs between terms. (Leave the first term positive.)


Data from Example 4

For the equation 4x5 − x4 − 4x3 + x2 − 5x − 6 = 0, we write

f(x) = = 4x5x4 - 4x + x - 5x - 6


Thus, there are no more than three positive and two negative roots.

f(x) = = 4x5x4 - 4x + x - 5x - 6 f(-x) = -4x5x4 + 4x + x + 5x - 6 three sign changes two sign changes

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