Retakes: -Turn in quiz corrections -Retakes Thursday and Friday at lunch, or as arranged before the end of next week. Today’s Plan -Correct -Combining Like Terms review and practice Assign. # Homework & Practice with Reteach or Challenge odds or evens on graph paper w/work 10/14/08 Like TermsPractice 2-9 #21

Terms in an expression are separated by + and –. A term can be a number, a variable, or a product of numbers and variables. 7x + 5 – 3y 2 + y + x3x3 term Coefficient: a number that is multiplied by a variable CoefficientVariable term 10/14/08 Like TermsPractice 2-9 #21

Like terms are terms with the same variable raised to the same power. Constants, like 5,, and 3.2, are also like terms Like Terms Unlike Terms 3x and 2x 5x 2 and 2x The exponents are different. 3.2 and n Only one term contains a variable 6a and 6b The variables are different w and w7w7 5 and /14/08 Like TermsPractice 2-9 #21

Insert Lesson Title Here Course Combining Like Terms Identify like terms in the list. 2x 4y 3 8x 5z 5y 3 8z Look for like variables with like powers. Like terms: 2x and 8x 4y 3 and 5y 3 5z and 8z 2x 4y 3 8x 5z 5y 3 8z

Insert Lesson Title Here Course Combining Like Terms x Combining like terms is like grouping similar objects. += x x x xx x xx xxxx x xxxx 4x4x+5x5x =9x9x To combine like terms that have variables, add or subtract the coefficients.

Combine like terms. Course Combining Like Terms A. 6t – 4t 2t2t 6t and 4t are like terms. Subtract the coefficients. B. 45x – 37y + 87 In this expression, there are no like terms to combine.

Combine like terms. Additional Example 2C: Combining Like Terms Course Combining Like Terms C. 3a 2 + 5b + 11b 2 – 4b + 2a 2 – 6 3a 2 + 5b + 11b 2 – 4b + 2a 2 – 6 5a 2 + b + 11b 2 – 6 Identify like terms. Add or subtract the coefficients. (3a 2 + 2a 2 ) + (5b – 4b) + 11b 2 – 6 Group like terms.

Insert Lesson Title Here Course Combining Like Terms Combine like terms. C. 4x 2 + 4y + 3x 2 – 4y + 2x x x 2 + 4y + 3x 2 – 4y + 2x (4x 2 + 3x 2 + 2x 2 )+ (4y – 4y) + 5

Assignment: 2-9 Homework & Practice with Reteach or Challenge -odds or even (different than neighbor) -On graph paper -Show all work Retakes: -Turn in quiz corrections first 10/14/08 Like TermsPractice 2-9 #21