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Online Quiz (Worksheet A B C D)

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Grade 7 - Mathematics
4.40 Formula for a2-b2 Difference of Two Squares

Consider the product (a+b).(a-b).
(a+b).(a-b) = a.a + b.a + a.(-b) + b.-b
= a2 + ab - ab - b2
Therefore (a+b)(a-b) = a2-b2
a2-b2 = (a+b)(a-b)

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

Directions: Solve the following problems. Also write at least ten examples of your own.
Q 1: (l-m)(l+m) = _____?

Q 2: (6a-7b)(6a+7b) = _____?

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Question 4: This question is available to subscribers only!

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