Question

Determine which factors of \( h(x) = x^{3} - 9x + 8 \) can be identified using the Factor Theorem.

Ask by Lee Chandler. in Norway
Dec 02,2024

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The factors of \( h(x) = x^{3} - 9x + 8 \) identified using the Factor Theorem are \( x = -\frac{1+\sqrt{33}}{2} \), \( x = 1 \), and \( x = \frac{-1+\sqrt{33}}{2} \).

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The Factor Theorem states that if a polynomial \( f(x) \) has a factor \( (x - r) \), then \( f(r) = 0 \). To find factors of \( h(x) = x^3 - 9x + 8 \), we can test possible rational roots using the Rational Root Theorem. The potential rational roots are the factors of the constant term (8) divided by the factors of the leading coefficient (1), which gives us ±1, ±2, ±4, ±8. By testing these values, we find: - \( h(1) = 1^3 - 9*1 + 8 = 0 \) (so \( (x - 1) \) is a factor) - \( h(2) = 2^3 - 9*2 + 8 = 0 \) (so \( (x - 2) \) is a factor) Thus, \( (x - 1)(x - 2) \) can be further factored along with \( (x + 4) \) from synthetic division or polynomial long division since the complete factorization results in the factors of \( h(x) \).

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