# Write a cubic function with the given zeros

The factor theorem leads to the following fact. How to Check Found a root? And this one actually is factorable. We can go back to the previous example and verify that this fact is true for the polynomials listed there. Read how to solve Linear Polynomials Degree 1 using simple algebra.

Now,those three roots could be real or complex roots. This does indeed equal 0. Well, subtract 3 from both sides. If you think about it, we should already know this to be true. So if you have any complex roots, the next possibility is one real and two complex roots.

We will also use these in a later example. So for example, these first two terms right over here have the common factor x squared.

Read The Factor Theorem for more details. Due to the nature of the mathematics on this site it is best views in landscape mode. So now we know the degree, how to solve?

Another giveaway that this is not going to be the function is that you are going to have a total of three roots. Well, when x squared is equal to negative 1. Zeroes with a multiplicity of 1 are often called simple zeroes. Another one, this looks like at 1, another one that looks at 3.

This example leads us to several nice facts about polynomials. So for example, in graph A-- and first of all, as always, I encourage you to pause this video and try it before I show you how to solve it. Show Solution First, notice that we really can say the other two since we know that this is a third degree polynomial and so by The Fundamental Theorem of Algebra we will have exactly 3 zeroes, with some repeats possible.

It is completely possible that complex zeroes will show up in the list of zeroes. Read how to solve Quadratic Polynomials Degree 2 with a little work, It can be hard to solve Cubic degree 3 and Quartic degree 4 equations, And beyond that it can be impossible to solve polynomials directly.

We can check easily, just put "2" in place of "x": When does x squared plus 1 equal 0, I should say? By experience, or simply guesswork.

In the next couple of sections we will need to find all the zeroes for a given polynomial. Its 0, it clearly has a 0 right at this point.

A "root" is when y is zero: Same thing for this one. So that looks like the point negative 3, 0. This is plus 3. But oftentimes, if someone expects you to, you might be able to group things in interesting ways, especially when you see that several terms have some common factors.

And this right over here has two real roots.

When we first looked at the zero factor property we saw that it said that if the product of two terms was zero then one of the terms had to be zero to start off with. So let us plot it first: We could write that as plus 1 times x plus 3. So this was actually pretty straightforward. What does this give us?

This will be a nice fact in a couple of sections when we go into detail about finding all the zeroes of a polynomial. Simply put the root in place of "x":Write the cubic function whose graph passes through (3,0), (º1,0), (º2,0), and (1,2).

Show that the n th-order finite differences for the given function of degree n. determine the number of zeros of polynomial functions.

Example 6 – Finding a Polynomial with Given Zeros Find a fourth-degree polynomial function with real coefficients that has –1, Example 7 – Finding the Zeros of a Polynomial Function Find all the zeros of f (x) 3 = x4 – 3x + 6x2 + 2x – 60 given that 1 + 3i is a zero of f.

Given the zeros of a polynomial, you can very easily write it -- first in its factored form and then in the standard form. Subtract the first zero.

The calculator will find zeros (exact and numerical, real and complex) of the linear, quadratic, cubic, quartic, polynomial, rational, irrational, exponential, logarithmic, trigonometric, hyperbolic, and absolute value function on the given interval. In this lesson you will learn how to write the equation of a polynomial by analyzing its x-intercepts.

Write the equation of a polynomial using its x-intercepts Write the equation of a polynomial using its x-intercepts From LearnZillion Created by Lyn Orletsky Standards. Factors and Zeros Date_____ Period____ Find all zeros. Write a polynomial function of least degree with integral coefficients that has the given zeros.

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Write a cubic function with the given zeros
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