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Nelly14
@Nelly14
May 2019
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Hello ! J'ai besoin de votre aide svp . Il faut que je résout ces inéquations en utilisant un tableau de signes :
A) x au carré < x
B) ( x+4 )( 5x+1 ) > 5x +1
C) ( 2x -4 ) au carré < ( 5x+9 ) au carré
Merci pour votre aide d'avance ^^
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ProfdeMaths1
Verified answer
X²<x
x²-x<0
x(x-1)<0
tab de signes ⇒ S=]0;1[
(x+4)(5x+1)>5x+1
(x+4)(5x+1)-(5x+1)>0
(5x+1)(x+4-1)>0
(5x+1)(x+3)>0
tab de signes ⇒ S=]-∞;-3[ U ]-1/5;+∞[
(2x-4)²<(5x+9)²
(2x+4)²-(5x+9)²<0
(2x+4+5x+9)(2x+4-5x-9)<0
(7x+13)(-3x-5)<0
(7x+13)(3x+5)>0
tab de signes ⇒ S=]-∞;-13/7[ U ]-5/3;+∞[
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Hey ! Et merci d'avance pour votre aide ^^
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Verified answer
X²<xx²-x<0
x(x-1)<0
tab de signes ⇒ S=]0;1[
(x+4)(5x+1)>5x+1
(x+4)(5x+1)-(5x+1)>0
(5x+1)(x+4-1)>0
(5x+1)(x+3)>0
tab de signes ⇒ S=]-∞;-3[ U ]-1/5;+∞[
(2x-4)²<(5x+9)²
(2x+4)²-(5x+9)²<0
(2x+4+5x+9)(2x+4-5x-9)<0
(7x+13)(-3x-5)<0
(7x+13)(3x+5)>0
tab de signes ⇒ S=]-∞;-13/7[ U ]-5/3;+∞[