Answer:
1) D=(4x-7)(2x-3)-(2x-3)²=8x²-12x-14x+21-(2x+3)(2x-3)=8x²-12x-14x+21-4x²-6x+6x-9=4x²-26x+12
2) D=(4x-7)(2x-3)-(2x-3)²=(2x-3)[4x-7-2x+3]=(2x-3)(2x-5)
3) I couldn't find an answer sorry
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