4x+8
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4x+8
4x+8<(根号23-4)x+2*(根号23-4) 解不等式
4x+8
4x+8 < √(23-4)x+2√(23-4)
[4-√(23-4)]x < 2[√(23-4)-4]
[4-√(23-4)]x < -2[4-√(23-4)]
比较上式两边,可知:
x<-2
4(x+2)<(√23-4)(x+2)
[4-(√23-4)](x+2)<0
(8-√23)(x+2)<0
因为8-√23>0
所以x+2<0
x<-2
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x(x+4)=8x+12
x(x-4)=2-8x