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### Grade 7 - Mathematics4.40 Formula for a2-b2 Difference of Two Squares

Formula:
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) = _____?l2-m2l2+m2m2-l22l2-2m2 Q 2: (6a-7b)(6a+7b) = _____?(a)2+(7b)26a2-7b2(12a)2-(6b)2(6a)2-(7b)2 Question 3: This question is available to subscribers only! Question 4: This question is available to subscribers only!

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