4(x-1)²-9(2x-1)²

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4(x-1)²-9(2x-1)²4(x-1)²-9(2x-1)²4(x-1)²-9(2x-1)²原式=[2(x-1)]^2-[3(2x-1)

4(x-1)²-9(2x-1)²
4(x-1)²-9(2x-1)²

4(x-1)²-9(2x-1)²
原式=[2(x-1)]^2-[3(2x-1)]^2=[2(x-1)-3(2x-1)][2(x-1)+3(2x-1)]=(2x-2-6x+3)(2x-2+6x-3)=(-4x+1)(8x-5).

原式=4x^2-8x+4-36x^2+36x-9=40x^2+28x-5

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