Combining Like Terms in Polynomials
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1 Section 1 6: Combining Like Terms in Polynomials Polynomials A polynomial is an expression that has two or more terms each separated by a + or sign. If the expression has only one term it is called a monomial. If the expression has two terms it is called a binomial. If the expression has three terms it is called a Trinomial. The degree of a polynomial with one variable is determined by the highest power or exponent of that variable in any of the terms. a constant is a zero a first degree degree monomial monomial binomial binomial 5 2x 5x x 2 + 3x a third degree a third degree x 2 7x + 2 5x 2 + x 1 3x 3 + 3x 1 x 3 2x 2 4x List the terms in a Polynomial In Descending Degrees of One Variable If each term of a polynomial is expressed in terms of one variable then we list the term with the highest power first and then list the other terms in descending order of their powers. Example 1 List the polynomial 4x 2 + 2x 3x x 3 in the correct order. The highest degree term is 3x 4 so list the fourth degree term 3x 4 first then list the third degree term 5x 3 next then list the second degree term 4x 2 next then list the first degree term 2x next and list the constant or zero degree term 9 last Example 2 List the polynomial 11 x 3 + 2x 2 3x 5 in the correct order. The highest degree term is 3x 5 so list the fifth degree term 3x 5 first then list the third degree term x 3 next then list the second degree term 2x 2 next and list the constant or zero degree term 11 last 3x 5 x 3 + 2x Math 100 Section 1 6 Page Eitel
2 Like Terms A polynomial is an expression with several terms. For terms to be considered like terms each term must have the exact same variables (letters) and each variable must have the exact same exponent as the other terms. The coefficients are not used to determine if the terms are alike. Like Terms can be combined by addition or subtraction to form a single term. Example of terms that include: 5x 2 and 3x 2 the x 2 in each term 4y 3 and y 3 the y 3 in each term 2x 2 y and 5x 2 y the x 2 y in each term Example of terms that are NOT like terms include: 5x 3 and 3x 2 are not like terms the x 3 and x 2 are not to the same power 4x 2 and y 2 are not like terms the x and y terms are not the exact same variables 2xy 2 and 5x 2 y are not like terms the xy 2 and x 2 y terms have the same letters but they do not have the exact same exponents Terms with Two or More Variables List the variables in any single term in alphabetical order If a single term has more then one variable we list the letters in alphabetical order. This allows us to more easily compare terms to see if they are alike. We do not write a term with an x and y as both xy and yx. It would be easy to think that they are not like terms. When you put them in the correct alphabetical order then it is clear they. List the letters in alphabetical order and put the coefficient in front of the variables 4yx 4xy 7y 2 x 7xy 2 y 2 x 3 6 6x 3 y 2 Math 100 Section 1 6 Page Eitel
3 Math 100 Section 1 6 Page Eitel Combining Like Terms Combining like terms involves determining the total of the coefficients of all the like terms. If there are three x terms in an expression like 3x + 2x + 5x then you can combine all three of the x terms and express that total with only one x term. This is done by adding or subtracting the coefficients of the x terms and using that number as the coefficient of the common variable x. Example 1 Example 2 3x + 2x + 5x 2x 2 + 4x 2 12x 2 To combine the like terms 3x + 2x + 5x To combine the like terms 2x 2 + 4x 2 12x 2 you combine the to get 10 you combine the to get 6 and use the common variable name x to get 3x + 2x + 5x =10x and use the common variable name x to get 2x 2 + 4x 2 12x 2 = 6x 2 To Combine Like Terms 1. Combine the coefficients of the like terms by adding or subtracting the coefficients. 2. Using the number in step 1 as the coefficient of the common variable. Example 3 Example 4 Example 5 5x + 8x combine the 5 +8 =13x 4y 9y combine the 4 9 = 5y 10xy xy combine the 10 1 = 9xy Example 6 Example 7 Example 8 3x 2 x 2 combine the 3 1 = 4x 2 3x 2 12x 2 combine the 3 12 = 9x 2 7xy 2 + xy 2 combine the 7 +1 = 8xy 2 Example 9 Example 10 Example 11 2y 2 8y 2 + 3y 2 combine the xy + 8xy xy combine the y 7y + 5y combine the = 3y 2 =10xy = 0
4 List all Polynomials In Descending Order List the term with the highest power first and then list the other terms in descending order of their powers: starts with the fourth power listed first and then lists the terms with lower powers in order. 3 x + x 2 x 2 x 3 3x 6x 2 6x 2 3x 9 x 2 x Example 1 List the polynomial 4x 2 + 2x 3x x 3 in the correct order the highest degree term is 3x 4 so list the fourth degree term 3x 4 first then list the third degree term 5x 3 next then list the second degree term 4x 2 next then list the first degree term 2x next and list the constant or zero degree term 9 last Example 2 List the polynomial 11 x 3 + 2x 2 3x 5 in the correct order the highest degree term is 3x 5 so list the fifth degree term 3x 5 first then list the third degree term x 3 next then list the second degree term 2x 2 next and list the constant or zero degree term 11 last 3x 5 x 3 + 2x Math 100 Section 1 6 Page Eitel
5 Simplify Polynomials with several different terms If a polynomial has several terms then all the terms may not be like terms. If that is the case then combine the different kinds of like terms separately and list the terms in descending order based on the terms powers. Example 1 Example 2 3x 2 + 5x +12x 2 + 8x 3xy 5y 2 + 3y 2 6xy the 3x 2 and the +12x 2 and can be combined to get 15x 2 the 5y 2 and the + 3y 2 and can be combined to get to get 2y 2 the + 5x and the + 8x and can be combined to get 13x the 3xy and the 6xy and can be combined to get to get 3xy to get 15x 2 +13x to get 2y 2 3xy Example Example 4 Example 5 5x + 4x 2 + 3x + 2x 2 for x 2 combine the for x combine the = 6x 2 + 8x 3x + 8 7x 2 for x combine the 3 7 combine the constants 8 2 = 4x + 6 3y 5y + 2y 2 9y 2 for y 2 combine the 2 9 for y combine the 3 5 = 7y 2 2y Example 6 Example 7 Example x 2 + 5x 2 3 x 2 9x 6x x + 2x x 3 2 y y y 11 3 y 2 for x 2 combine the for x combine the 5 9 for x 2 combine the 6 +2 for x combine the for y 2 combine the for y combine the = 2x 2 4x = 4x 2 2x = 3y 2 2y Math 100 Section 1 6 Page Eitel
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