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Ex 1.5,2 - Chapter 1 Class 9 Number Systems - Part 4

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Ex1.5, 2 Simplify each of the following expressions: (iv) ( 5 2) ( 5 + 2) ( 5 2) ( 5 + 2) We know that, (a + b) (a-b) = a2 b2 Putting a = 5, b = 2 = ( 5)2 ( 2)2 = 5 2 = 3

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