
Вадим
6 год назад
Решить методом интервалов неравенство:
1) (х+2)(х-7)>0
2) (х+5)(х-8)<0
ОТВЕТЫ

Мокий
Aug 15, 2019
(x+5)(x−8)lt;0
x2−3x−40lt;0
Lets find the critical points of the inequality.
x2−3x−40=0
(x+5)(x−8)=0
x+5=0 or x−8=0
x=−5 or x=8
xlt;−5
−5lt;xlt;8
xgt;8
Answer:
−5lt;xlt;8
(x+2)(x−7)gt;0
x2−5x−14gt;0
x2−5x−14=0
(x+2)(x−7)=0
x+2=0 or x−7=0
x=−2 or x=7
xlt;−2
−2lt;xlt;7
xgt;7
Answer:
xlt;−2 or xgt;7
x2−3x−40lt;0
Lets find the critical points of the inequality.
x2−3x−40=0
(x+5)(x−8)=0
x+5=0 or x−8=0
x=−5 or x=8
xlt;−5
−5lt;xlt;8
xgt;8
Answer:
−5lt;xlt;8
(x+2)(x−7)gt;0
x2−5x−14gt;0
x2−5x−14=0
(x+2)(x−7)=0
x+2=0 or x−7=0
x=−2 or x=7
xlt;−2
−2lt;xlt;7
xgt;7
Answer:
xlt;−2 or xgt;7
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