Mathematics
Grade 7
15 min
Identify terms and coefficients
Identify terms and coefficients
Tutorial Preview
1
Introduction & Learning Objectives
Learning Objectives
Define an algebraic expression and its components.
Accurately identify individual terms within a given algebraic expression.
Distinguish between constant terms and variable terms.
Correctly identify the numerical coefficient for any variable term.
Recognize and state the coefficient of 1 or -1 when it is not explicitly written.
Apply their understanding of terms and coefficients to analyze simple algebraic statements.
Ever wonder how mathematicians break down complex math problems into smaller, manageable pieces? 🤔 Just like a recipe has ingredients, algebraic expressions have building blocks!
In this lesson, you'll learn to identify the fundamental parts of algebraic expressions: terms and coefficients. Mastering this skill is crucial for understa...
2
Key Concepts & Vocabulary
TermDefinitionExample
Algebraic ExpressionA mathematical phrase that can contain numbers, variables (like x or y), and operation symbols (like +, -, ×, ÷), but no equals sign.$$3x + 5$$ or $$2a - 7b + 1$$
TermA single number, a single variable, or a product of numbers and variables within an algebraic expression. Terms are separated by addition (+) or subtraction (-) signs.In $$4x - 2y + 9$$, the terms are $$4x$$, $$-2y$$, and $$9$$.
VariableA symbol, usually a letter, that represents an unknown numerical value.In $$5x + 8$$, '$$x$$' is the variable. In $$a - 3b$$, '$$a$$' and '$$b$$' are variables.
Variable TermA term that contains one or more variables.In $$6y + 10 - 2z$$, the variable terms are $$6y$$ and $$-2z$$.
Constant TermA term that is a number by it...
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Core Formulas
Rule for Identifying Terms
Terms in an algebraic expression are separated by addition ($$+$$) or subtraction ($$−$$$) signs.
To find the terms, look for the plus and minus signs that break the expression into its individual parts. Each part, including its sign, is a term.
Rule for Identifying Coefficients
The coefficient of a variable term is the number directly multiplying the variable(s).
Once you've identified a variable term, the number in front of the variable is its coefficient. Remember to include the sign in front of the number.
Rule for Implied Coefficients
If a variable appears without a numerical factor (e.g., $$x$$ or $$-y$$), its coefficient is $$1$$ or $$-1$$ respectively.
Mathematicians often don't write '$$1x$$' or '$$ -1y$$&#...
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Challenging
Which algebraic expression has exactly three terms, a constant term of -5, and a term with a coefficient of 2 for the variable `y`?
A.`2y - 5`
B.`x + 2y + 5`
C.`5y - 2`
D.`x + 2y - 5`
Challenging
Which statement is true about the expression `-x + 3y - 9`?
A.It has two terms and the constant is 9.
B.The coefficient of `x` is 1 and the coefficient of `y` is 3.
C.It has three terms and the constant is -9.
D.The terms are `x`, `3y`, and `9`.
Challenging
What is the coefficient of `x` in the expression `(1/2)x - y + 7`?
A.1/2
B.2
C.1
D.x
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