Mathematics
Senior High
なぜx<－4、－2<xと求められるのですか
□ 207 次の連立不等式を解け。
x2+6x+8>0
(1)
x2+2x-3<0
207 (1) x2+6x+8> 0 から
よって
x<-4, -2<x
x2+2x-3<0 から
F
3<x<1
(x+4)(x+2) > 0
****
(x+3)(x-1) < 0
(2)
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