Factorise :
a2 - 0.36 b2
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= (a)2 - (0.6 b)2
Using the formula
[∵ (x2 - y2) = (x + y)(x - y)]
= (a + 0.6b)(a - 0.6b)
Hence, a2 - 0.36 b2 = (a + 0.6b)(a - 0.6b)
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