化简:(3x+1)(2x-3)— 2(x-1)(4x+1)再求x=-2时的结果

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化简:(3x+1)(2x-3)— 2(x-1)(4x+1)再求x=-2时的结果

化简:(3x+1)(2x-3)— 2(x-1)(4x+1)再求x=-2时的结果
化简:(3x+1)(2x-3)— 2(x-1)(4x+1)
再求x=-2时的结果

化简:(3x+1)(2x-3)— 2(x-1)(4x+1)再求x=-2时的结果
原式=-2x^2-x-1
x=-2时,原式得-7

(3x+1)(2x-3)— 2(x-1)(4x+1)
=6x²-7x-3-8x²+6x+2
=-2x²-x-1当x=-2时,上式=-8+2-1=-7

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