Mathematics Grade 9 15 min

Add doubles - complete the sentence

Add doubles - complete the sentence

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Introduction & Learning Objectives

Learning Objectives Translate 'add doubles' scenarios into algebraic expressions and equations. Apply the principle of doubling to complete logical statements involving variables, polynomials, and functions. Formulate a general function rule, f(x) = 2x, to represent an 'add doubles' relationship. Analyze the structure of a logical implication (if-then statement) based on a doubling pattern. Solve for unknown variables or expressions in equations derived from 'add doubles' sentences. Represent the 'add doubles' relationship graphically as a linear function. Differentiate between adding a term to itself (doubling) and multiplying a term by itself (squaring). If a computer function doubles any value you input, how would you write a sing...
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Key Concepts & Vocabulary

TermDefinitionExample Doubling PrincipleThe logical and mathematical concept of adding a quantity to itself. This operation is equivalent to multiplying the quantity by 2.Doubling the number 7 is 7 + 7, which equals 14. Algebraically, doubling the variable 'n' is n + n, which simplifies to 2n. Algebraic ExpressionA mathematical phrase that can contain ordinary numbers, variables (like x or y), and operators (like add, subtract, multiply, and divide).The phrase 'a number x is doubled' can be written as the expression x + x, or more simply, 2x. EquationA statement that asserts the equality of two expressions. It is characterized by the presence of an equals sign (=).The sentence 'If a number x is doubled, the result is 24' translates to the equation 2x = 24. Lo...
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Core Formulas

The Additive Double Identity n + n = 2n This is the fundamental algebraic rule for 'adding doubles'. It states that adding any quantity (number, variable, or expression) 'n' to itself is always equivalent to multiplying that quantity by 2. The Functional Representation of Doubling f(x) = 2x This rule defines the 'add doubles' operation as a linear function. The output, f(x), is always twice the input, x. This allows us to analyze the relationship graphically and apply it to various inputs. The Distributive Property for Doubling 2(a + b) = 2a + 2b When doubling an expression with multiple terms, you must apply the multiplication by 2 to every term within the expression. This is crucial for correctly doubling polynomials and binomials.

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Sample Practice Questions

Challenging
If adding a polynomial P(x) to itself results in a new polynomial Q(x), complete the sentence: The expression P(x) + Q(x) is equivalent to ______.
A.2P(x)
B.4P(x)
C.3P(x)
D.P(x)²
Challenging
A sequence of operations follows a logical pattern: adding a term X to itself gives Y, and adding Y to itself gives Z. Complete the sentence: The term Z is equivalent to ______.
A.4 times the original term X
B.3 times the original term X
C.the square of the original term X
D.8 times the original term X
Challenging
Let the function g(x) = x + 3. Let the 'add doubles' function be f(x) = 2x. Complete the sentence: The composite function f(g(x)), which represents doubling the output of g(x), is equal to ______.
A.2x + 3
B.2x + 6
C.x + 6
D.(x + 3)²

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