作业帮（x+3x+2）(4x^2+8x+3)-90 （因式分解）
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（x+3x+2）(4x^2+8x+3)-90 （因式分解）
（x+3x+2）(4x^2+8x+3)-90 （因式分解）
（x+3x+2）(4x^2+8x+3)-90 （因式分解）
（x+3x+2）(4x^2+8x+3)-90
=(x+1)(x+2)(2x+3)(2x+1)-90
=(x+1)(2x+3)(x+2)(2x+1)-90
=(2x^2+5x+3)(2x^2+5x+2)-90
=(2x^2+5x)^2+5(2x^2+5x)+6-90
=(2x^2+5x)^2+5(2x^2+5x)-84
=(2x^2+5x+12)(2x^2+5x-7)
=(2x^2+5x+12)(2x+7)(x-1)
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（x²+3x+2）(4x^2+8x+3)-90
=(x+1)(x+2)(2x+1)(2x+3)-90
=(x+1)(2x+3)(x+2)(2x+1)-90
=(2x²+5x+3)(2x²+5x+2)-90
=(2x²+5x)²+5(2x²+5x)+6-90
=(2x²+5x+12)(2x²+5x-7)
=(2x² +5x+12)(2x+7)(x-1)
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