# Write a polynomial function of degree 3rd

This can help narrow down your possibilities when you do go on to find the zeros. Possible number of positive real zeros: The up arrow is showing where there is a sign change between successive terms, going left to right. Zeros of polynomials and their graphs Video transcript - [Voiceover] So, we have a fifth-degree polynomial here, p of x, and we're asked to do several things.

First, find the real roots. And let's sort of remind ourselves what roots are. So root is the same thing as a zero, and they're the x-values that make the polynomial equal to zero.

So the real roots are the x-values where p of x is equal to zero. So, the x-values that satisfy this are going to be the roots, or the zeros, and we want the real ones.

As you'll learn in the future, there's also going to be imaginary roots, or zeros, or there might be. Then we want to think about how many times, how many times we intercept the x-axis.

Well as we'll see, however many real roots we have that's how many times we are going to intercept However many unique real roots we have, that's however many times we're going to intercept the x-axis.

How do I know that? Well, let's just think about an arbitrary polynomial here. So those are my axes. This is the x-axis, that's my y-axis. And let me just graph an arbitrary polynomial here. So, let's say it looks like that. Well, what's going on right over here.

At this x-value, we see, based on the graph of the function, that p of x is going to be equal to zero. So that's going to be a root.

## Why too much evidence can be a bad thing

This is also going to be a root, because at this x-value, the function is equal to zero. At this x-value the function's equal to zero. At this x-value the function is equal zero. If we're on the x-axis then the y-value is zero.

So the function is going to be equal to zero. This is a graph of y is equal, y is equal to p of x. Not necessarily this p of x, but I'm just drawing some arbitrary p of x. So there's some x-value that makes the function equal to zero.

## Polynomial Equation Calculator - Symbolab

Well, that's going to be a point at which we are intercepting the x-axis. So we want to know how many times we are intercepting the x-axis.Write a 3rd degree polynomial function in expanded form with integer coefficients that has the given zeros: x=-4i, and x=/5.

Some notes and solutions to Russell and Norvig's Artificial Intelligence: A Modern Approach (AIMA, 3rd edition). - [Voiceover] So, we have a fifth-degree polynomial here, p of x, and we're asked to do several things. First, find the real roots. And let's sort of remind ourselves what roots are. Third Degree Polynomials. Third degree polynomials are also known as cubic polynomials. Cubics have these characteristics: One to three roots.

## Related Stories

Two or zero extrema. One inflection point. Point symmetry about the inflection point. Range is the set of real numbers. Three fundamental shapes. Four points or pieces of information are required to define a cubic polynomial function. Multiply the factors and you shall have a 3rd degree polynomial/5.

If -1, 1, 1, and -6 are zeros of a polynomial, then => => => => Therefore, the polynomial must be: And the function would then be Use the same method to solve all of the rest. The degree of the resulting polynomial (the highest power on x) must equal the number of roots given if .

Lagrange polynomial - Wikipedia