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Audrey977
@Audrey977
April 2019
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Resoudre inequation -2x²>-4
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Commentaires (10)
Verified answer
- 2x² > - 4 sur [ - 5 ; 4 [
2x² < 4
x² < 4/2
x² - 2 < 0
(x - √2)(x + √2) < 0
x - 5 - √2 + √2 4
x - √2 - - 0 +
x + √2 - 0 + +
f(x) + 0 - 0 +
0 votes
Thanks 1
audrey977
merci a vous deux
audrey977
et si xappartient a [-5;4[?
audrey977
OK
charlesetlou
Verified answer
2x^2 <4 ^2 veut dire "au carré"
x^2 <2
(x-V2)(x+V2) <0
x -V2 +V2
x-V2 - - +
x+V2 - + +
(x-V2)(x+V2) + - +
donc S=)-V2;+V2(
1 votes
Thanks 1
audrey977
et si on vouliat le representer graphiquement: sir l,axe des absisses ca serais -2 et 2 / sur l,axe des ordonné ca serais 4?????
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Verified answer
- 2x² > - 4 sur [ - 5 ; 4 [2x² < 4
x² < 4/2
x² - 2 < 0
(x - √2)(x + √2) < 0
x - 5 - √2 + √2 4
x - √2 - - 0 +
x + √2 - 0 + +
f(x) + 0 - 0 +
Verified answer
2x^2 <4 ^2 veut dire "au carré"x^2 <2
(x-V2)(x+V2) <0
x -V2 +V2
x-V2 - - +
x+V2 - + +
(x-V2)(x+V2) + - +
donc S=)-V2;+V2(