(x+1)^2+3(x+1)-4=0(1)令x+1=t,则原方程化为:t^2+3t-4=0因式分解得:(t+4)(t-1)=0解得t=1或-4即x+1=1或x+1=-4解得x=0或-5(2)将原方程展开得:x^2+2x+1+3x+3-4=0即x^2+5x=0因式分解得x(x+5)=0解得x=0或-5
(x+1)^2+3(x+1)-4=0(x+1+4)(x+1-1)=0x(x+5)=0x=0,x=-5