Mathematics
Grade 8
15 min
Multiply polynomials using algebra tiles
Multiply polynomials using algebra tiles
Tutorial Preview
1
Introduction & Learning Objectives
Learning Objectives
Identify and represent monomials and polynomials using algebra tiles.
Set up an area model for polynomial multiplication using algebra tiles.
Determine the product of two polynomials by filling in the area model with algebra tiles.
Combine like terms represented by algebra tiles to simplify the product.
Multiply a monomial by a binomial using algebra tiles.
Multiply two binomials using algebra tiles.
Ever wondered how to visually 'build' multiplication problems? 🤔 Get ready to use hands-on tools to solve complex algebra problems!
In this lesson, you'll learn how to multiply polynomials using algebra tiles, a powerful visual tool. This method helps you understand the distributive property and how terms combine, making abstract algebra conc...
2
Key Concepts & Vocabulary
TermDefinitionExample
Algebra TilesPhysical or virtual manipulatives used to represent numbers, variables, and their squares. They come in different sizes and colors to distinguish positive and negative values.A small square tile represents '1' (or '-1'), a long rectangular tile represents 'x' (or '-x'), and a large square tile represents 'x²' (or '-x²').
MonomialAn algebraic expression consisting of a single term, which can be a constant, a variable, or a product of constants and variables with whole number exponents.Examples include `5`, `x`, `3y`, `-2x²`.
PolynomialAn algebraic expression consisting of one or more terms, where each term is a monomial. Terms are separated by addition or subtraction.Examples include `x+2`, `3x-7...
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Core Formulas
Area Formula for Rectangles
$$ \text{Area} = \text{length} \times \text{width} $$
This fundamental rule is the basis for using algebra tiles. We arrange the polynomial factors as the length and width of a rectangle, and the tiles that fill the interior represent the product (the area).
Multiplication of Signed Numbers
$$ (+) \times (+) = (+), \quad (-) \times (-) = (+), \quad (+) \times (-) = (-) $$
When multiplying tiles, the color (positive or negative) of the product tile is determined by the colors of the dimension tiles. For example, a positive 'x' tile multiplied by a negative '1' tile results in a negative 'x' tile.
Distributive Property (Visualized)
$$ a(b+c) = ab + ac $$
While not a direct formula for tiles, the area model visua...
5 more steps in this tutorial
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Challenging
Use the area model to find the product of (2x+1)(x+2).
A.2x² + 5x + 2
B.2x² + 3x + 2
C.3x² + 5x + 2
D.2x² + 4x + 1
Challenging
What is the product of (x-3)(2x+1) using an algebra tile model?
A.2x² + 5x - 3
B.2x² - 5x - 3
C.2x² - 6x + 1
D.3x² - 5x - 3
Challenging
A student models the multiplication of (x-2)(x+2) and gets a final answer of x² + 4x - 4. Their model contains one x² tile, four positive x tiles, and four negative 1 tiles. What error did they make?
A.They multiplied the constants incorrectly; (-2)×(+2) should be +4.
B.They set up the dimensions incorrectly.
C.They did not correctly form and remove the zero pairs from the 'x' tiles.
D.They should have used two x² tiles.
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