factorise the sum...........
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Step-by-step explanation:
(i)16a²-25/9a²
=(4a)²-(5/3a)²
={4a-(5/3a)}{(4a+(5/3a)}
(ii)(x+2)²-(x+4)²
=x²+4x+4-x²-8x-16
=-4x-12
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