factorise it (2a-3b)² - 16b²
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(2a-3b)² - 16b²
=((2a-3b)+16b)((2a-3b)-4b) [∵(a+b)(a-b)=a²-b²]
=(2a-3b+4b)(2a-3b-4b)
=(2a+b)(2a-7b)
=((2a-3b)+16b)((2a-3b)-4b) [∵(a+b)(a-b)=a²-b²]
=(2a-3b+4b)(2a-3b-4b)
=(2a+b)(2a-7b)
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