factorise these two questions please
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(iv) 8(2a+3b)³ - 12(2a+3b)²
4(2a+3b)²[ 2(2a+3b) - 3] = 4(2a+3b)² [ 4a+6b-3]
4(2a+3b)(2a+3b)[4a+6b-3]
(v)9a(x-2y)⁴ - 12a(x-2y)³
3a(x-2y)³[3(x-2y) - 4]
3a(x-2y)(x-2y)(x-2y)[3x-6y -12]
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