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Presentation transcript:

1/11 1/11

Multiplying Polynomials

Recall our rule for multiplying variables: ADD THE EXPONENTS!

Steps: 1. Use the distributive property to multiply a polynomial by a monomial. 2. After you multiply, remember to only ADD OR SUBTRACT LIKE TERMS.

Find each product and simplify. 2x(x2 + 3) 4y(x2 +y3) 5x(2x + 7)

Find each product and simplify. 4. 2n(9n2 – 2n – 12) 5. 8x2(2x2 – 4x + 4) 7. u(7u – 2) + 25u 6. 8g2(g2 + 9h – 6gh)

Find each product and simplify. 8. -2xy2(4xyz + 3x – 8) 9. 5b(-b2 + 7b -1) + 9(3b2 – 6b + 2)

Find each product and simplify. 10. 4z2(3z – 7) + z(7z2 – 5z + 2) – 4(z2 + 9z)

Find the area of the garden. 11. Maria’s garden is a rectangle. The garden has a width of 2x and a length of 3x – 6. Find the area of the garden. A=L∙W 2x 3x – 6

12. Find the area of the garden if x = 4 feet Area: 6x2 – 12x

Solve each equation. 13. 4(-6x + 9) + 4 = -4(-5x + 12) 14. x(x – 4) + 2x = x(x + 12) – 7

STOP!!!

1/11 1/11 1/14

Multiplying a binomial by a binomial. & Multiplying a binomial by a trinomial.

To multiply (binomial)(binomial) we must choose one of two methods: F.O.I.L or Double distribution You can choose whichever way you find easiest! It does not matter to me which one you choose.

irst terms FOIL uter terms nner terms ast terms FOIL method to multiply two binomials. irst terms (Step 1) uter terms (Step 2) FOIL nner terms (Step 3) ast terms (Step 4) (Step 5) – Combine like terms!!!!

Example #1 Multiply: (x + 5) ( x + 9)

Example #1 Multiply: (x + 5) ( x + 9) Step 1: FIRST TERMS = x2

Example #1 Multiply: (x + 5) ( x + 9) = x2 + 9x = x2 Step 2: OUTER TERMS = x2 + 9x = x2

Example #1 Multiply: (x + 5) ( x + 9) = x2 + 9x +5x = x2 + 9x Step 3: INNER TERMS = x2 + 9x +5x = x2 + 9x

1. Multiply: (x + 5) ( x + 9) = x2 + 9x +5x +45 = x2 + 9x +5x Step 4: LAST TERMS = x2 + 9x +5x +45 = x2 + 9x +5x

Step 5: COMBINE LIKE TERMS 1. Multiply: (x + 5) ( x + 9) Step 5: COMBINE LIKE TERMS = x2 + 9x +5x +45 = x2 + 14x+45

2. Multiply: (x + 7) ( x - 3)

Find each product. 3. (g + 5)(g – 2) 4. (5x + 9)(9x + 3)

Find each product. 5. (2y + 3)(4y – 1) 6. (9w – 4)(9w + 4)

You may see this type of problem written on a test life this: 7. Find the product of (x+4) and (x - 5).

Find each product. 8. (x – 3)2 9. (x + 2)2

Find each product. 10. (2x – 8)2

To multiply: (binomial)(trinomial) You must use: double distributive property.

11. (x + 3)(-2x2 + 6x – 7)

12. (2x + 7)(3x2 + 8x – 4)

CHALLENGE!!!!! 13. (2x2 – 5x + 3)( 6x2 + 3x – 9)

You have the class to work on BOTH page 8’s. 1/11 1/11 1/14 1/15 30 You have the class to work on BOTH page 8’s. Whatever you don’t finish ends up being HW. Ms. Hillstrom will come around and give you check marks!