# Write a cubic function given the coordinates

Inverses of functions algebra Video transcript So we have f of x is equal to negative x plus 4, and f of x is graphed right here on our coordinate plane. Let's try to figure out what the inverse of f is. And to figure out the inverse, what I like to do is I set y, I set the variable y, equal to f of x, or we could write that y is equal to negative x plus 4. Due to the nature of the mathematics on this site it is best views in landscape mode. If your device is not in landscape mode many of the equations will run off the side of your device should be able to scroll to see them and some of the menu items will be cut off due to the narrow screen width. Graphing Polynomials In this section we are going to look at a method for getting a rough sketch of a general polynomial.

In this section we are going to either be given the list of zeroes or they will be easy to find. In the next section we will go into a method for determining a large portion of the list for most polynomials.

Do not worry about the equations for these polynomials. We are giving these only so we can use them to illustrate some ideas about polynomials. First, notice that the graphs are nice and smooth. There are no holes or breaks in the graph and there are no sharp corners in the graph.

The graphs of polynomials will always be nice smooth curves. The following fact will relate all of these ideas to the multiplicity of the zero. This will always happen with every polynomial and we can use the following test to determine just what will happen at the endpoints of the graph.

A good example of this is the graph of x2. A good example of this is the graph of x3.

## Find a cubic function y = ax3 bx2 cx d whose graph has horizontal tangents at

A good example of this is the graph of -x2. A good example of this is the graph of -x3. Process for Graphing a Polynomial Determine all the zeroes of the polynomial and their multiplicity.

Use the leading coefficient test to determine the behavior of the polynomial at the end of the graph. Plot a few more points. This is left intentionally vague.

The more points that you plot the better the sketch. At the least you should plot at least one at either end of the graph and at least one point between each pair of zeroes.

We should give a quick warning about this process before we actually try to use it. This process assumes that all the zeroes are real numbers. If there are any complex zeroes then this process may miss some pretty important features of the graph.

The coefficient of the 5th degree term is positive and since the degree is odd we know that this polynomial will increase without bound at the right end and decrease without bound at the left end.

Finally, we just need to evaluate the polynomial at a couple of points. We just want to pick points according to the guidelines in the process outlined above and points that will be fairly easy to evaluate.

Here are some points. We will leave it to you to verify the evaluations. The graph is now decreasing as we move to the right. In fact, determining this point usually requires some Calculus. So, we are moving to the right and the function is increasing.

Here is a sketch of the polynomial. Note that one of the reasons for plotting points at the ends is to see just how fast the graph is increasing or decreasing.

## Graphing on the go? There's an app for that!

The coefficient of the 4th degree term is positive and so since the degree is even we know that the polynomial will increase without bound at both ends of the graph. Finally, here are some function evaluations.

That means that as we move to the right the graph will actually be decreasing. Here is a sketch of the graph. Here is a list of all the zeroes and their multiplicities. In this case the coefficient of the 5th degree term is negative and so since the degree is odd the graph will increase without bound on the left side and decrease without bound on the right side.

Here are some function evaluations. Note as well that the graph should be flat at this point as well since the multiplicity is greater than one. Since we know that the graph will decrease without bound at this end we are done.

Here is the sketch of this polynomial.For my program to work, I need to write a function that takes four x/y points (fixed or floating, doesn't matter) and returns the a,b,c and d values that describe that cubic curve.

Going back to MJD's answer, I followed the steps as outlined below. For the x/y inputs, I'm using eight letters rather than using MJD's sub-scripts as I can type these.

Sep 16,  · Ok so im stuck on this and dont know how to approach it. It isnt like the other typical zeros root problems ive seen where they give you the x metin2sell.com it is Write an equation for a cubic polynomial P(x)with leading coefficient −1 whose graph passes through the point (2, 8) and is tangent to the x axis at the metin2sell.com i have done .

## Cubic Spline Iterative Method for Poisson’s Equation in Cylindrical Polar Coordinates

Given the graph of a function y' = f '(x) a standard approach is to identity intervals over which its graph is positive, other intervals over which it is negative, and its intercepts.

Next use this information to identify behavior of the graph of y = f(x), and then provide a sketch based on the information recorded. In a cubic function, the highest degree on any variable is three.

The function f (x) = x 3 is the parent function. You start graphing the cubic function parent graph at the origin (0, 0). firstly we have been given the function y= x^3 - 4x whose graph we have to metin2sell.com we are given the function y = (x-1)^3 -4(x-1) whose graph we have to draw as metin2sell.com i know it is a transformation of the first graph,but i cant see metin2sell.com help would be.

A spline curve is a mathematical representation for which it is easy to build now we can write a program that constructs cubic curves. The user enters Because each curve segment is represented by a cubic polynomial function, we have to solve for four coe .

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