# Write a third-degree polynomial function. make a table of values and a graph

Note that in the table, we calculated the error for each sensor at each RH standard. If we simply took an average, the resulting value would minimize the average error since the positive and negative values would cancel each other. The formula for RMSE is below: Think of a polynomial graph of higher degrees degree at least 3 as quadratic graphs, but with more twists and turns. The same is true with higher order polynomials. If we can factor polynomials, we want to set each factor with a variable in it to 0, and solve for the variable to get the roots.

This is because any factor that becomes 0 makes the whole expression 0.

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This is the zero product property: So, to get the roots zeros of a polynomial, we factor it and set the factors to 0. Note these things about polynomials: These are also the roots. We see that the end behavior of the polynomial function is: Notice also that the degree of the polynomial is even, and the leading term is positive.

End Behavior and Leading Coefficient Test There are certain rules for sketching polynomial functions, like we had for graphing rational functions.

Again, the degree of a polynomial is the highest exponent if you look at all the terms you may have to add exponents, if you have a factored form. The leading coefficient of the polynomial is the number before the variable that has the highest exponent the highest degree. In factored form, sometimes you have to factor out a negative sign.

If there is no exponent for that factor, the multiplicity is 1 which is actually its exponent! And remember that if you sum up all the multiplicities of the polynomial, you will get the degree! The total of all the multiplicities of the factors is 6, which is the degree.

Also note that sometimes we have to factor the polynomial to get the roots and their multiplicity. Here are the multiplicity behavior rules and examples:View and Download TEXAS INSTRUMENTS TI STATS manual book online.

GRAPHING CALCULATOR. TI STATS Calculator pdf manual download. Third Degree Polynomials. Third degree polynomials are also known as cubic polynomials. Cubics have these characteristics: One to three roots. Two or zero extrema. Graphs of Third Degree Polynomials. The graphs of several third degree polynomials are shown along with questions and answers at the bottom of the page.

Polynomial of a second degree polynomial: cuts the x axis at one point.

## 12 Mean, standard deviation and variance

Figure 4: Graph of a third degree polynomial, one intercpet. Answers to Above Questions. The graph of a polynomial function is always a smooth curve; that is, it has no breaks or We make a table of values of P(x), making sure we choose test points between (and to the right and left of) successive zeros. The polynomial P has odd degree and positive leading coeﬃcient. Thus, the end behavior of P is similar to x3. Polynomial Graphs and Roots. We learned that a Quadratic Function is a special type of polynomial with degree 2; these have either a cup-up or cup-down shape, depending on whether the leading term (one with the biggest exponent) is positive or negative, respectively.

Think of a polynomial graph of higher degrees (degree at least 3) as quadratic graphs, but with more twists and turns.

Graphing Polynomial Functions Make a table of values to find several points. Make sure that the graph follows the end behavior as found in the above step.

Example: Graph the polynomial function x 3 − 2 x 2 − 3 x. Predict the end behavior of the function. The degree of the polynomial function is odd and the leading coefficient is.