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Online Quiz (Worksheet A B C D)

Questions Per Quiz = 2 4 6 8 10

Grade 7 - Mathematics
2.2 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) = _____?
x1-5x+5
x2-4x+2
-x2+4x+3
-x2-4x+2

Q 2: (3x3-2x2-9x)-(x3-2x2-5x) = _____?
x2+x2+4x
2x3-4x
x2+4x-4
x3+4

Q 3: (8x3-7x2+5)-(7x2-5) = _____?
7x3+2x2+5
8x3+4x2+10
8x3-14x2+10
6x3+2x2+6

Q 4: (2x2-3x+1)-(7x+3) = _____?
5x2+3x-2
2x2-10x-2
-2x2+8x-5
2x2+10x-2

Q 5: (3x2-2x+1)-(2x2+7x+2) = _____?
-x3+5x+2
x2+8x+1
x1+4x+6
x2-9x-1

Q 6: (12x2-7x+3)-(4x2-3x+2) = _____?
8x2-4x+1
8x2+4x-1
5x2+3x+3
6x2+2x+2

Question 7: This question is available to subscribers only!

Question 8: This question is available to subscribers only!


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