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Equation For A Polynomial Graph – Thoughts Your Choices

canspiration by canspiration
November 22, 2022
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This put up incorporates 4 issues much like questions that seem on exams.

Query 1

Write an equation for the cubic polynomial that corresponds to the graph of the perform proven.

Query 2

The quartic polynomial f(x) has a number one coefficient of 1. The graph of y = f(x) is proven. Write an equation for f(x).

Query 3

A 4th diploma polynomial is divisible by x2 + 1 and x + 5. Which graph may symbolize the perform outlined by this polynomial?

Query 4

Write an equation for the polynomial that might correspond to the graph of the perform proven.

As common, watch the video for an answer.

Equation For A Polynomial Graph

Or hold studying.
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“All can be nicely in case you use your thoughts to your choices, and thoughts solely your choices.” Since 2007, I’ve devoted my life to sharing the enjoyment of recreation principle and arithmetic. MindYourDecisions now has over 1,000 free articles with no advertisements because of neighborhood assist! Assist out and get early entry to posts with a pledge on Patreon.

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Reply To Equation For A Polynomial Graph

(Just about all posts are transcribed shortly after I make the movies for them–please let me know if there are any typos/errors and I’ll appropriate them, thanks).

Typically a polynomial will be written in factored type because the product of a scaling issue a and linear components (x – xi) the place xi is a root of the polynomial. From the graph of the polynomial, we are able to take the x-intercept values as roots, after which we are able to use different values to find out the scaling issue. We will additionally take a look at the habits of the graph to find out the multiplicity of a root. If the graph crosses the x-axis the basis has an odd multiplicity whereas if the graph “bounces” the basis has a fair multiplicity. Moreover a polynomial of diploma n has precisely n roots.

We are going to use these rules to unravel the issues.

Query 1

Write an equation for the cubic polynomial that corresponds to the graph of the perform proven.

The graph of the third diploma polynomial is proven with 3 x intercepts (3, 0), (2, 0), (-3, 0). Thus we all know its three roots and now we have:

p(x) = a(x – 3)(x – 2)(x + 3)

The y intercept is (0, 18) so now we have:

18 = p(0)
18 = a(0 – 3)(0 – 2)(0 + 3)
18 = 18a
a = 1

Thus the equation is:

p(x) = (x – 3)(x – 2)(x + 3)

Query 2

The quartic polynomial f(x) has a number one coefficient of 1. The graph of y = f(x) is proven. Write an equation for f(x).

The graph of the 4th diploma polynomial is proven with 3 roots, so one in every of them is a double root. The roots are 3, 0, and -4. The graph “bounces” at (0, 0) indicating that x = 0 is a double root. Thus now we have the 4 roots. We’re given the main coefficient is 1, so now we have the equation:

f(x) = (x – 0)2(x – 3)(x + 4)
f(x) = x2(x – 3)(x + 4)

Query 3

A 4th diploma polynomial is divisible by x2 + 1 and x + 5. Which graph may symbolize the perform outlined by this polynomial?

For the reason that polynomial is divisible by x2 + 1, one in every of its components is x2 + 1. So a root of this equation can be a root of the polynomial.

x2 + 1 = 0
x = i, –i

The polynomial has two imaginary roots, so these two roots is not going to cross the x axis on the graph. Thus the quartic polynomial graph ought to have at most 2 intersections with the x-axis. We will get rid of choices (a) and (d) which every present 4 intersections with the x-axis.

One other issue is x + 5 giving the basis x = -5. This excludes (b). Choice (c) is the reply.

Query 4

Write an equation for the polynomial that might correspond to the graph of the perform proven.

The polynomial has x-intercepts of -1, 2 and -4. The graph bounces off the x-axis at x = -1 so this can be a double root (or some even energy). The graph has an inflection level at x = 2 like a cubic perform so now we have some odd multiplicity. Lastly we are able to take the basis x = 4 as a easy linear issue.

So the polynomial may very well be one thing like:

f(x) = a(x + 1)2(x – 2)3(x – 4)

Utilizing the y-intercept of (0, -4) we are able to resolve for the scaling issue:

-4 = f(0)
-4 = a(0 + 1)2(0 – 2)3(0 – 4)
-4 = a(1)2(-2)3(-4)
-4 = 32a
a = -1/8

Thus one attainable equation is:

f(x) = (-1/8)(x – 2)3(x + 1)2(x – 4)

References

NY Regents pattern polynomial questions
https://www.jmap.org/Worksheets/A.APR.B.3.GraphingPolynomialFunctions2.pdf

Method for polynomial features
https://programs.lumenlearning.com/waymakercollegealgebra/chapter/writing-formulas-for-polynomial-functions/

Polynomial features
https://www.mathcentre.ac.uk/assets/uploaded/mc-ty-polynomial-2009-1.pdf

Polynomial features one other
https://www.stocktonusd.web/cms/lib/CA01902791/Centricity/Area/3176/Pre_Cal_Lesson_4-1_Polynomials_WITHOUT_Quiz.pdf

Query 1
https://www.nysedregents.org/algebratwo/617/algtwo62017-exam.pdf

Query 2
https://www.nysedregents.org/algebratwo/118/algtwo12018-exam.pdf

Query 3
https://www.nysedregents.org/algebratwo/618/algtwo62018-exam.pdf

Query 4
https://programs.lumenlearning.com/waymakercollegealgebra/chapter/writing-formulas-for-polynomial-functions/

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