factorise this question
3a⁴ - 48b⁴
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3a⁴ - 48b⁴
= 3 (a⁴ - 16b⁴)
= 3 [ (a²)² - (4b²)²]
= 3 [ (a²+4b²)(a²-4b²) ]
= 3 (a²+4b²)[ (a)²-(2b)² ]
= 3 (a²+4b²)[ (a+2b)(a-2b) ]
= 3 (a²+4b²)(a+2b)(a-2b)
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