factorise = 81a^4-16b^4
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Step-by-step explanation:
(3a)⁴-(2b)⁴=0
((3a)²)²-((2b)²)²=0
((3a)²+(2b)²)((3a)²-(2b)²)
((3a)²+(2b)²)((3a-2b)(3a+2b))
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