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Question
Factorise: (0·7)2 - (0·3)2
Sum
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Solution
(0·7)2 - (0·3)2
= (0.7 + 0.3) (0.7 - 0.3) ....[a2 – b2 = (a + b) (a – b)]
= 1 × 0.4 = 0.4
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Factorisation by Difference of Two Squares
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