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b) (2a-3)(3a+4)
= 6a²+8a-9a-12
= 6a²-a-12
= -16x³y-8xy²+24x²y²+4x²
=-8xy²(1+3x)+4x²(-4xy+1)
b)(2a-3)(3a+4)
= 6a²-9a+8a - 12
= 6a² -a - 12