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# Review of multiplying polynomials

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Review of the 3 ways to multiply polynomials

Review of the 3 ways to multiply polynomials

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### Transcript

• 1. Objective Review Multiplying Polynomials By the end of this presentation, youshould review the FOIL method, Boxmethod and the distributive property. Designed by Skip Tyler, Varina High School
• 2. Remember, there are 3 techniques you can use for multiplying polynomials. can use for multiplying polynomials. It’s all about how you write it… » Distributive Property » FOIL 3)Box Method
• 3. Multiply. (2x + 3)(5x + 8)Using the distributive property,multiply 2x(5x + 8) + 3(5x + 8). 2 10x + 16x + 15x + 24 Combine like terms. 2 10x + 31x + 24 A shortcut of the distributive property is called the FOIL method.
• 4. The acronym FOIL reminds you to multiply the: you to multiply the: First terms Outer terms Inner terms Last terms of the 2 binomials
• 5. The FOIL method is ONLY used whenyou multiply 2 binomials. It is an acronym and tells you which terms to multiply. Use the FOIL method to multiply the following binomials: (y + 3)(y + 7).
• 6. The third method is the Box Method. This method works for every problem! Here’s how you do it. Multiply (3x – 5)(5x + 2) 3x -5 Draw a box. Write a polynomial on the top and side of a box. It does not 5x matter which goes where.This will be modeled in the +2 next problem along with FOIL.
• 7. Multiply (3x - 5)(5x + 2) 2 First terms: 15x 3x -5 Outer terms: +6x Inner terms: -25x 5x 15x2 -25x Last terms: -10 Combine like terms. 2 +2 +6x -10 15x - 19x – 10You have 3 techniques. Pick the one you like the best!
• 8. Multiply (2x - 5)(x2 - 5x + 4) Combine like terms! 2 x -5x +4 2xNow you do the rest.... then click to reveal the answer -5 3 2 2x – 15x + 33x - 20
• 9. Multiply (y + 4)(y – 3)Which of the answers listed is the correct one.Click on the screen to find out! • y2 + y – 12 • y2 – y – 12 • y2 + 7y – 12 4. y2 – 7y – 12 • y2 + y + 12 • y2 – y + 12 • y2 + 7y + 12 8. y2 – 7y + 12
• 10. Multiply (2a – 3b)(2a + 4b)Try another one on your own. You choose the method.Click to reveal the answer. 1. 4a2 + 14ab – 12b2 2. 4a2 – 14ab – 12b2 • 4a2 + 8ab – 6ba – 12b2 • 4a2 + 2ab – 12b2 • 4a2 – 2ab – 12b2