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Online Quiz (Worksheet A B C D)

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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).
9x2-4y2
81x2-4y2
81x2-2y2

Question 2: This question is available to subscribers only!


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