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Question
Simplify by using formula :
(2x + 3y) (2x - 3y)
Sum
Solution
(2x + 3y) (2x - 3y)
= (2x)2 - (3y)2
= 4x2 - 9y2
(Using identity : (a + b) (a - b) = a2 - b2).
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