Question

用换元法解方程(x^2+5x)^2+10x^2+50x+24=0

要详细的过程和答案

Answer 1

(x^2+5x)^2+10x^2+50x+24=0
(x^2+5x)^2+10(x^2+5x)+24=0
设(x^2+5x)=y
即y^2+10y+24=0
(y+4)(y+6)=0
y1=-4,y2=-6
x^2+5x=-4或x^2+5x=-6
(x+1)(x+4)=0或(x+2)(x+3)=0
x1=-1,x2=-4,x3=-2,x4=-3

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Answer 2

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