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# Chapter 4

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### Chapter 4

1. 1. MTH 209, Chapter 4 slides By Marie E. Borrazzo
2. 2. What’s a Polynomial? <ul><li>Polynomials are sums of &quot;variable and exponent&quot; expressions. </li></ul><ul><li>Each piece of the polynomial, each part that is being added, is called a &quot;term&quot;. </li></ul><ul><li>Polynomial terms have variables which are raised to whole-number exponents (or else the terms are just plain numbers); there are no square roots of variables, no fractional powers, and no variables in the denominator of any fractions. </li></ul>
3. 3. What’s a Polynomial? <ul><li>Poly - nomials </li></ul><ul><li>Many names </li></ul>
4. 4. Here are some examples: <ul><ul><li>4x 4 + 3y 2 </li></ul></ul><ul><ul><li>3x 2 + 4x + 3 </li></ul></ul><ul><ul><li>3r -5 </li></ul></ul>
5. 5. The Parts of a Polynomial <ul><li>3x 2 + 4x + 6 </li></ul>Leading coefficient Constant
6. 6. The degree of a Polynomial <ul><li>3x 2 + 4x + 6 </li></ul>The degree of the polynomial is determined by the highest exponent power of the polynomial. This is a second degree polynomial.
7. 7. The terms of a Polynomial <ul><li>3x 2 + 4x + 6 </li></ul>This polynomial has three terms : 3x 2 , 4x, and 6
8. 8. Another example <ul><li>Give the degree of the following polynomial: 2x 5 – 5x 3 – 10x + 9 </li></ul><ul><li>This polynomial has four terms, including a fifth-degree term, a third-degree term, a first-degree term, and a constant term. </li></ul>
9. 9. Degrees and terms? <ul><li>Give the degree of the following polynomial: 7x 4 + 6x 2 + x </li></ul><ul><li>This polynomial has three terms, including a fourth-degree term, a second-degree term, and a first-degree term. There is no constant term. This is a fourth-degree polynomial. </li></ul>
10. 10. Coefficient vs. leading coefficient <ul><li>When a term contains both a number and a variable part, the number part is called the &quot;coefficient&quot;. The coefficient on the leading term is called the &quot;leading&quot; coefficient. </li></ul>
11. 11. Monomial <ul><li>a one-term polynomial, such as 2x or 4x 2 , may also be called a &quot;monomial&quot; (&quot;mono&quot; meaning &quot;one&quot;) </li></ul>
12. 12. Binomial <ul><li>a two-term polynomial, such as 2x + y or x 2 – 4, may also be called a &quot;binomial&quot; (&quot;bi&quot; meaning &quot;two&quot;) </li></ul>
13. 13. Trinomial <ul><li>a three-term polynomial, such as 2x + y + z or x 4 + 4x 2 – 4, may also be called a &quot;trinomial&quot; (&quot;tri&quot; meaning &quot;three&quot;) </li></ul>
14. 14. Polynomials and their degree: <ul><li>a second-degree polynomial, such as 4x 2 , x 2 – 9, or ax 2 + bx + c, is also called a &quot;quadratic&quot; </li></ul><ul><li>a third-degree polynomial, such as –6x 3 or x 3 – 27, is also called a &quot;cubic&quot; </li></ul><ul><li>a fourth-degree polynomial, such as x 4 or 2x 4 – 3x 2 + 9, is sometimes called a &quot;quartic&quot; </li></ul><ul><li>a fifth-degree polynomial, such as 2x 5 or x 5 – 4x 3 – x + 7, is sometimes called a &quot;quintic&quot; </li></ul>
15. 15. Adding polynomials <ul><li>When you add polynomials you will merely worry about the coefficient not the variable and its exponent. </li></ul><ul><li>Remember you can ONLY add like terms. </li></ul>
16. 16. Adding polynomials <ul><li>Lets add monomials: 2x 2 and 3x 2 </li></ul><ul><li>2 x 2 + 3 x 2 = 5 x 2 </li></ul><ul><li>Notice the x square remains unchanged. </li></ul><ul><li>If these terms had different exponent values you could NOT add or subtract them . </li></ul>
17. 17. Subtracting polynomials <ul><li>Lets subtract: 7x 2 and 3x 2 </li></ul><ul><li>7 x 2 - 3 x 2 = 4 x 2 </li></ul><ul><li>Notice the x square remains unchanged. </li></ul><ul><li>If these terms had different exponent values you could NOT add or subtract them . </li></ul>
18. 18. Adding polynomials <ul><li>Lets add a trinomial and a binomial: </li></ul><ul><li>7x 2 - 4x + 4 </li></ul><ul><li>3x 2 + 6 </li></ul><ul><li>7x 2 - 4x + 4 plus 3x 2 + 6 = 10x 2 - 4x+ 10 </li></ul><ul><li>Notice the exponents remain unchanged. </li></ul><ul><li>Notice you can only add like terms. </li></ul>
19. 19. Subtracting polynomials <ul><li>Lets subtract a trinomial and a binomial: </li></ul><ul><li>7x 2 - 4x + 4 </li></ul><ul><li>3x 2 + 6 </li></ul><ul><li>7x 2 - 4x + 4 minus ( 3x 2 + 6) = 4 x 2 - 4x - 2 </li></ul><ul><li>Notice the exponents remain unchanged. </li></ul><ul><li>Notice you can only add like terms. </li></ul>