Factorise :
(0.7)2 - (0.3)2
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Using the formula
[∵ (x2 - y2) = (x + y)(x - y)]
= (0.7 + 0.3)(0.7 - 0.3)
= (1.0) x (0.4)
= 0.4
Hence,(0.7)2 - (0.3)2 = 0.4
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