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Online Quiz (Worksheet A B C D)

Questions Per Quiz = 2 4 6 8 10

Grade 8 - Mathematics
7.25 Special Products - Sum and Difference Pattern: (a+b)(a-b) = a2-b2

Formula : (a+b)(a-b) = a2-b2

Example:
Find the product (3x+2y)(3x-2y).
Solution:
Clearly the given expression is in the form of (a+b)(a-b) with 3x for a and 2y for b.
Therefore, (3x+2y)(3x-2y) = (3x)2-(2y)2
= 9x2-4y2

Example:
Find the product (t+5)(t-5).
Solution:
(t)2-(5)2
= t2-25


Directions: Solve the following questions. Also write at least ten examples of your own.
Q 1: Find the product (9x+2y)(9x-2y).
81x2-2y2
9x2-4y2
81x2-4y2

Q 2: Find the product (5x+9y)(5x-9y).
5x2-81y2
25x2-81y2
25x2-9y2

Q 3: Find the product (7x+2y)(7x-2y).
49x2-4y2
49x2-2y2
7x2-4y2

Q 4: Find the product (5x+2y)(5x-2y).
5x2-4y2
25x2-2y2
25x2-4y2

Q 5: Find the product (4x+5y)(4x-5y).
16x2-25y2
16x2-5y2
4x2-25y2

Q 6: Find the product (7x+5y)(7x-5y).
49x2-5y2
49x2-25y2
7x2-25y2

Q 7: Find the product (2x+7y)(2x-7y).

4x2-7y2
4x2-49y2
2x2-49y2

Q 8: Find the product (4x+7y)(4x-7y).
4x2-49y2
16x2-49y2
16x2-7y2

Question 9: This question is available to subscribers only!

Question 10: This question is available to subscribers only!


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