Splash Screen. Example 1 Identify Possible Zeros A. List all of the possible rational zeros of f(x) = 3x 4 – x 3 + 4. Answer:

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Presentation transcript:

Splash Screen

Example 1 Identify Possible Zeros A. List all of the possible rational zeros of f(x) = 3x 4 – x Answer:

Example 1 Identify Possible Zeros B. List all of the possible rational zeros of f(x) = x 4 + 7x 3 – 15. Since the coefficient of x 4 is 1, the possible zeros must be a factor of the constant term –15. Answer: So, the possible rational zeros are ±1, ±3, ±5, and ±15.

A.A B.B C.C D.D Example 1 A. List all of the possible rational zeros of f(x) = 2x 3 + x + 6. A. B. C. D.

A.A B.B C.C D.D Example 1 B. List all of the possible rational zeros of f(x) = x 3 + 3x A. B. C. D.

Example 3 Find All Zeros Find all of the zeros of f(x) = x 4 + x 3 – 19x x From the corollary to the Fundamental Theorem of Algebra, we know there are exactly 4 complex roots. According to Descartes’ Rule of Signs, there are 2 or 0 positive real roots and 2 or 0 negative real roots. The possible rational zeros are  1,  2,  3,  5,  6,  10,  15, and  30. Make a table and test some possible rational zeros.

Example 3 Find All Zeros Since f(2) = 0, you know that x = 2 is a zero. The depressed polynomial is x 3 + 3x 2 – 13x – 15.

Example 3 Find All Zeros Since x = 2 is a positive real zero, and there can only be 2 or 0 positive real zeros, there must be one more positive real zero. Test the next possible rational zeros on the depressed polynomial. There is another zero at x = 3. The depressed polynomial is x 2 + 6x + 5.

Example 3 Find All Zeros Factor x 2 + 6x + 5. Answer: The zeros of this function are –5, –1, 2, and 3. Write the depressed polynomial. Factor. Zero Product Property or There are two more real roots at x = –5 and x = –1.

A.A B.B C.C D.D Example 3 A.–10, –3, 1, and 3 B.–5, 1, and 3 C.–5 and –3 D.–5, –3, 1 and 3 Find all of the zeros of f(x) = x 4 + 4x 3 – 14x 2 – 36x + 45.

End of the Lesson