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- 196
- àï9.2ëCombining Like Terms
-
- äèPlease combine the like terms in the following Variable
- Expressions.
-
- âèCombine like terms.
-
- êêêè 3x + 5x + 6y - 3y
- êêêè3x + 5x + 6y + (-3y)
- êêêï(3x + 5x) + (6y + (-3y))
- êêêï(3 + 5)x + (6 + (-3))y
- êêêêï8x + 3y
-
-
- éSè "Like Terms" are terms that have the same letters with the
- same exponents.ïIn the expression, 3x + 5x + 6y - 3y, the terms "3x"
- and "5x" are like terms.ïAlso, "6y" and "-3y" are like terms.ïLike
- terms can be combined by adding or subtracting the coefficients (the
- numbers out in front of the variable) using the rules for signed numbers
- and then attaching the common letter.
-
- For example, "3x" and "5x" can be combined by adding the coefficients "3"
- and "5" and attaching the letter "x".
- êêêï3x + 5xï=ï(3 + 5)xï= 8x
-
- Also, the "6y" and "-3y" can be combined by subtracting the coefficients
- and attaching the "y".
- êê 6y - 3yï=ï6y + (-3y)ï=ï(6 + (-3))yï=ï3y
-
- This proceedure is usually done in the following manner.
- êêêë3x + 5x + 6y - 3y
- êêêè 3x + 5x + 6y + (-3y)
-
- Group the like terms using parençs.
- êêêï(3x + 5x) + (6y + (-3y))
-
- Combine the coefficients using the rules for signed numbers.
- êêêï(3 + 5)x + (6 + (-3))y
- êêêêè8x + 3y
-
- This is as far as you can go, because the terms "8x" and "3y" are Unlike
- Terms and can not be combined.
- 1è Combine like terms.
-
- êêêè 8x + 5x + 7y - 4y
-
- ë A)ï10x - 4yë B)ï13x + 3yë C)ï3x - 3yë D)ïå
-
-
- ü
- êêêè 8x + 5x + 7y - 4y
- êêêè8x + 5x + 7y + (-4y)
- êêê (8x + 5x) + (7y + (-4y))
- êêê (8 + 5)x + (7 + (-4))y
- êêêêï13x + 3y
-
-
- Ç B
- 2è Combine like terms.
-
- êêêè 4a + 2b - 3a - 6b
-
- ë A)ïa - 4bê B)ï7a - 8bêC)ïa - 8bêD)ïå
-
-
- ü
- êêêè 4a + 2b - 3a - 6b
- êêê 4a + 2b + (-3a) + (-6b)
- êêê(4a + (-3a)) + (2b + (-6b))
- êêê(4 + (-3))a + (2 + (-6))b
- êêêê 1a + (-4b)
- êêêêèa - 4b
-
- Ç A
- 3è Combine like terms.
-
- êêêè 11x - 4x + 8y - 3y
-
- ë A)ïx + 10yêB)ï7x + 5yêC)ï3x - 4yë D)ïå
-
-
- ü
- êêêè 11x - 4x + 8y - 3y
- êêê 11x + (-4x) + 8y + (-3y)
- êêë (11x + (-4x)) + (8y + (-3y))
- êêê (11 + (-4))x + (8 + (-3))y
- êêêêè7x + 5y
-
- Ç B
- 4è Combine like terms.
-
- êêêè3a + 4b + 6a + 4c + b
-
- è A)ï9a + 4b + 4cè B)ï9a + 5b + 4cè C)ï9a + 8bë D)ïå
-
-
- ü
- êêêè3a + 4b + 6a + 4c + b
- êêê (3a + 6a) + (4b + b) + 4c
- êêêï(3 + 6)a + (4 + 1)b + 4c
- êêêê 9a + 5b + 4c
-
-
- Ç B
- 5è Combine like terms.
-
- #êêêè2xì + 3xì + 5x - 2x
-
- #è A)ï5xì + 3xê B)ï8xìêèC)ï5xÅ + 3xëD)ïå
-
-
- ü
- #êêêè2xì + 3xì + 5x - 2x
- #êêêï2xì + 3xì + 5x + (-2x)
- #êêê (2xì + 3xì) + (5x + (-2x))
- #êêêï(2 + 3)xì + (5 + (-2))x
- #êêêêï5xì + 3x
-
- Ç A
- 6è Combine like terms.
-
- #êêêè5xì - 6xì + 4yì - 7yì
-
- #è A)ï-2xì + 3yìë B)ï2xì - 3yìè C)ï-xì - 3yìè D)ïå
-
-
- ü
- #êêêè5xì - 6xì + 4yì - 7yì
- #êêêï5xì + (-6xì) + 4yì + (-7yì)
- #êêê (5xì + (-6xì)) + (4yì + (-7yì))
- #êêêï(5 + (-6))xì + (4 + (-7))yì
- #êêêêï-1xì +(-3yì)
- #êêêêè-xì - 3yì
- Ç C
- 7è Combine like terms.
-
- êêêè4a + 7b + 3b - 4a
-
- è A)ï8a - 7bêïB)ï8a + 4bë C)ï10bêïD)ïå
-
-
- ü
- êêêë 4a + 7b +3b - 4a
- êêêè 4a + 7b + 3b + (-4a)
- êêêè(4a + (-4a)) + (7b + 3b)
- êêêêè 0 + 10b
- êêêêë 10b
-
- Ç C
- 8è Combine like terms.
-
- êêêè2a + 3b + 5a - 3b - 7a
-
- è A)ï0êê B)ï14aêèC)ï7bêèD)ïå
-
-
- ü
- êêêè 2a + 3b + 5a - 3b - 7a
- êêêè2a + 3b + 5a + (-3b) + (-7a)
- êêêï(2a + 5a + (-7a)) + (3b + (-3b))
- êêêï(2 + 5 + (-7))a + (3 + (-3))b
- êêêêë 0a + 0b
- êêêêêï0
- Ç A
- 9è Combine like terms.
-
- êêêè12x - 3y - 2x - 10y
-
- è A)ï8x + 12yê B)ï10x - 13yë C)ï3x - 7yëD)ïå
-
-
- ü
- êêêë12x - 3y - 2x - 10y
- êêêï12x + (-3y) + (-2x) + (-10y)
- êêê (12x + (-2x)) + (-3y + (-10y))
- êêê (12 + (-2))x + (-3 + (-10))y
- êêêêï10x + (-13)y
- êêêêè10x - 13y
- Ç B
- 10è Combine like terms.
-
- êêêë-12p - 15p + q
-
- è A)ï-27êë B)ï-26pêè C)ï-27p + qè D)ïå
-
-
- ü
- êêêë -12p - 15p + q
- êêêè (-12p) + (-15p) + q
- êêêè (-12 + (-15))p + q
- êêêêè-27p + q
-
-
- Ç C
-
-
-