logx+2(4X+5)-logx+2(x^2+4X+4)-1=0
logx+2(4X+5)-logx+2(x+2)^2-1=0
logx+2(4X+5)-2-1=0
logx+2(4X+5)=3
4x+5=(x+2)^3
x=-1啊我也计算到4x+5=(x+2)^3就是卡这里算不下去 求详细的解答过程4x+5=(x+2)^34x+5=x^3+6x^2+12x+8x^3+6x^2+8x+3=0(x+1)(x^2+5x+3)=0x=-1x=(-5±√13)/2经检验x=-1是原方程的根