Multiplying Binomials using Algebra Tiles - Georgia Standards
[Pages:3]Multiplying Binomials using Algebra Tiles In this task, you will learn how to multiply two binomials using Algebra tiles. 1. Find the product (x + 1)(x + 4).
a. Build your model. Make a rectangle with a width of x + 1 and a length of x + 4.
b. Fill in the area with algebra tiles. The area of an x by x is an x2 tile.
c. Continue to fill in the area with algebra tiles, using an x tile for the area of x by 1.
d. Fill the area of the empty space with the unit tiles, since the area of 1 by 1 is 1.
e. To find the product of (x + 1)(x + 4), add all of the algebra tiled area. For this problem, there is one x2 tile, 5 x tiles, and 4 unit tiles. Therefore, (x + 1)(x + 4) = x2 + 5x + 4.
2. Find the product (x ? 3)(x + 4). Since one of the binomials contains subtraction, we will need to use the negative algebra tiles to represent these values.
a. Build your model. Make a rectangle with a width of x - 3 and a length of x + 4. The -3 units are represented using the red unit tiles.
b. Fill in the area with algebra tiles. Keep in mind that the product of a negative and a positive is a negative value. Be sure to use the appropriate tiles.
c. Use your algebra tiles to determine the product of (x - 3)(x + 4). (Hint: If your answer is not a trinomial, can you do anything to simply your polynomial?)
d. How do the algebra tile models in problem #1 and problem #2 differ?
Practice: Use algebra tiles to find each of the following products.
1. (x + 2)(x + 3)
2. (x + 4)(x ? 3)
3. (x ? 3)2
4. (2x ? 3)(x ?2)
5. Hector noticed that instead of using algebra tiles, he can just draw an area model to multiply binomials. Do you think this method will work? Explain why or why not.
x
+ 8
x
x2
8x
+5 5x
40
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