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### Grade 7 - Mathematics2.2 Subtraction of Polynomials

 Let A and B are two polynomials, then A-B = A+(-B) Example: Let A = 3x2+2x-1 and B = 2x2-x+1, find 'A-B'. Solution: The additive inverse of B is -B, that is -2x2+x-1. A-B = A+(-B) = (3x2+2x-1)+(-2x2+x-1) = (3x2-2x2)+(2x+x)+(-1-1) = (3-2)x2+(2+1)x+(-1-1) = x2+3x-2. Directions: Solve the following problems. Also write at least ten examples of your own.
 Q 1: (x2-9x+7)-(2x2-5x+5) = _____?x2-4x+2-x2-4x+2x1-5x+5-x2+4x+3 Q 2: (3x2-2x+1)-(2x2+7x+2) = _____?x2-9x-1x2+8x+1x1+4x+6-x3+5x+2 Q 3: (2x2-3x+1)-(7x+3) = _____?2x2+10x-22x2-10x-2-2x2+8x-55x2+3x-2 Q 4: (2x2-8x)-(x2-8x) = _____?x2+16x2x2-16xx2-8xx2 Q 5: (12x2-7x+3)-(4x2-3x+2) = _____?6x2+2x+25x2+3x+38x2+4x-18x2-4x+1 Q 6: (8x3-7x2+5)-(7x2-5) = _____?6x3+2x2+68x3+4x2+107x3+2x2+58x3-14x2+10 Question 7: This question is available to subscribers only! Question 8: This question is available to subscribers only!

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