Concept explainers
To find: All the real zeros of the function f(x)=x3−2x2−8x+5 and find exact values if possible. Identify each zeros rational or irrational or complex.
The real zeros are x=−2.34,0.57,3.77 .
Given information:
The given function is f(x)=x3−2x2−8x+5 .
Concept used:
Factor theorem: A polynomial function has a factor x−k if only if f(k)=0 .
Rational zero theorem: Suppose f is a function of degree n≥1 of the form
f(x)=anxn+an−1xn−1+......+a0 with every coefficient an integer and a0≠0. If x=pq is a rational zero of f where p and q have no common integers other than ±1 then p is an integer factor of the constant a0 and q is an integer factor of the leading coefficient a0 .
Calculations:
f(x)=x3−2x2−8x+5
The possible rational zeros are ±1,±5 .
Now check the zeros:
f(1)=(1)3−2(1)2−8(1)+5=1−2−8+5=−4
Thus, x=−1 is not rational zeros.
f(−1)=(−1)3−2(−1)2−8(−1)+5=−1−2+8+5=10
Thus, x=1 is not rational zero.
f(−5)=(−5)3−2(−5)2−8(−5)+5=−125−50+40+5=−130
Thus, x=−5 is not rational zero.
f(5)=(5)3−2(5)2−8(5)+5=125−50−40+5=40
Thus, x=5 is not rational zero.
This is prime equation and cannot factor it.
There is not any exact real zeros. Now find the rational zeros using graph.
The graph of function,
From the graph the real zeros are x=−2.34,0.57,3.77 .
Chapter 2 Solutions
PRECALCULUS:GRAPHICAL,...-NASTA ED.
- solve these pleasearrow_forwardA factorization A = PDP 1 is not unique. For A= 7 2 -4 1 1 1 5 0 2 1 one factorization is P = D= and P-1 30 = Use this information with D₁ = to find a matrix P₁ such that - -1 -2 0 3 1 - - 1 05 A-P,D,P P1 (Type an integer or simplified fraction for each matrix element.)arrow_forwardMatrix A is factored in the form PDP 1. Use the Diagonalization Theorem to find the eigenvalues of A and a basis for each eigenspace. 30 -1 - 1 0 -1 400 0 0 1 A= 3 4 3 0 1 3 040 3 1 3 0 0 4 1 0 0 003 -1 0 -1 Select the correct choice below and fill in the answer boxes to complete your choice. (Use a comma to separate vectors as needed.) A basis for the corresponding eigenspace is { A. There is one distinct eigenvalue, λ = B. In ascending order, the two distinct eigenvalues are λ₁ ... = and 2 = Bases for the corresponding eigenspaces are { and ( ), respectively. C. In ascending order, the three distinct eigenvalues are λ₁ = = 12/2 = and 3 = Bases for the corresponding eigenspaces are {}, }, and { respectively.arrow_forward
- N Page 0.6. 0.4. 0.2- -0.2- -0.4- -6.6 -5 W 10arrow_forwardDiagonalize the following matrix, if possible. 8 0 6 - 8 Select the correct choice below and, if necessary, fill in the answer box to complete your choice. 8 0 OA. For P= D= 0 3 6 0 B. For P = D= 0 -6 8 0 C. For P = D= 0 - 8 D. The matrix cannot be diagonalized.arrow_forwardCalculus lll May I please have the solutions for the following exercises? Thank youarrow_forward
- Calculus lll May I please have the solution for the following question? Thank youarrow_forwardFind three horizontal tangents between [0,10]arrow_forward4 In the integral dxf1dy (7)², make the change of variables x = ½(r− s), y = ½(r + s), and evaluate the integral. Hint: Find the limits on r and s by sketching the area of integration in the (x, y) plane along with the r and s axes, and then show that the same area can be covered by s from 0 to r and r from 0 to 1.arrow_forward
- Calculus: Early TranscendentalsCalculusISBN:9781285741550Author:James StewartPublisher:Cengage LearningThomas' Calculus (14th Edition)CalculusISBN:9780134438986Author:Joel R. Hass, Christopher E. Heil, Maurice D. WeirPublisher:PEARSONCalculus: Early Transcendentals (3rd Edition)CalculusISBN:9780134763644Author:William L. Briggs, Lyle Cochran, Bernard Gillett, Eric SchulzPublisher:PEARSON
- Calculus: Early TranscendentalsCalculusISBN:9781319050740Author:Jon Rogawski, Colin Adams, Robert FranzosaPublisher:W. H. FreemanCalculus: Early Transcendental FunctionsCalculusISBN:9781337552516Author:Ron Larson, Bruce H. EdwardsPublisher:Cengage Learning





