Lesson 4: Subtracting Polynomials

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Presentation transcript:

Lesson 4: Subtracting Polynomials MFM1P Lesson 4: Subtracting Polynomials Learning Goals: I can add subtract polynomials

Lesson 4: Subtracting Polynomials MFM1P Lesson 4: Subtracting Polynomials

Lesson 4: Subtracting Polynomials MFM1P Lesson 4: Subtracting Polynomials Determine: (x2 – 3x + 5) – (-3x2 + 2x – 1) We are starting with: x2 – 3x + 5

Lesson 4: Subtracting Polynomials MFM1P Lesson 4: Subtracting Polynomials From this we need to take away: -3x2 + 2x – 1 The problem is we don’t have any of these tiles to take away

Lesson 4: Subtracting Polynomials MFM1P Lesson 4: Subtracting Polynomials From this we need to take away: -3x2 + 2x – 1

Lesson 4: Subtracting Polynomials MFM1P Lesson 4: Subtracting Polynomials Now, what do we have left?

Lesson 4: Subtracting Polynomials MFM1P Lesson 4: Subtracting Polynomials So, when we subtracted (-3x2 + 2x – 1) from (x2 – 3x + 5) we really added +3x2, -2x, and +1.

Lesson 4: Subtracting Polynomials MFM1P Lesson 4: Subtracting Polynomials When subtracting polynomials, ADD the OPPOSITE. Step One: Change the subtraction ( - ) sign inbetween the polynomials to addition (+) Step Two: Change all the signs inside the second polynomial Step Three: Add the polynomials

Lesson 4: Subtracting Polynomials MFM1P Lesson 4: Subtracting Polynomials Example: (-3x2 + 4x – 1) – (2x2 + 3x – 5)

Lesson 4: Subtracting Polynomials MFM1P Lesson 4: Subtracting Polynomials Example: (4x2 + 4x + 8) – (-9x2 + 6x + 1)

Lesson 4: Subtracting Polynomials MFM1P Lesson 4: Subtracting Polynomials Homework/Practice Pg. 265 #5, 7, 8, 10, 11