7. Confirm that 2 is an upper bound and -15 is a lower bound for the real zeros off(x) :x4 + 14x3 + 56x² + 34x – 105.8. Use the discriminant to determine the number of x-intercepts of the parabolag(x) = 4x2 + 3x – 3.9. For the function k(x) = -(x – 6)² – 4 , identify the vertex and the axis of symmetryand state whether the vertex is a minimum or a maximum.

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Confirm that 2 is an upper bound and -15 is a lower bound for the real zeros of f(x) = x* + 14x3 + 56x² + 34x – 105. -

Elements Of Modern Algebra

8th Edition

ISBN:9781285463230

Author:Gilbert, Linda, Jimmie

Publisher:Gilbert, Linda, Jimmie

Chapter8: Polynomials

Section8.4: Zeros Of A Polynomial

Problem 31E

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Try substituting 1. You will get 6 and not 0. Try other real values also. What About -2? Let us check.

Question

7. Confirm that 2 is an upper bound and -15 is a lower bound for the real zeros of
f(x) :
x4 + 14x3 + 56x² + 34x – 105.
8. Use the discriminant to determine the number of x-intercepts of the parabola
g(x) = 4x2 + 3x – 3.
9. For the function k(x) = -(x – 6)² – 4 , identify the vertex and the axis of symmetry
and state whether the vertex is a minimum or a maximum.

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