Bonjour,
Factoriser:
f(x)= (3-2x)²-(3x+2)²
f(x)= (3-2x-3x-2)(3-2x+3x+2)
f(x)= (-5x+1)(x+5)
f(x)= -(5x-1)(x+5)
Résoudre f(x) ≤ 0
-5x+1= 0 ou x+5= 0
x= 1/5 x= -5
x I -∞ -5 1/5 + ∞ I
f(x) I - 0 + 0 -
S= ] - ∞ ; - 5 ] ∪ [ 1/ 5; +∞ [
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Bonjour,
Factoriser:
f(x)= (3-2x)²-(3x+2)²
f(x)= (3-2x-3x-2)(3-2x+3x+2)
f(x)= (-5x+1)(x+5)
f(x)= -(5x-1)(x+5)
Résoudre f(x) ≤ 0
-5x+1= 0 ou x+5= 0
x= 1/5 x= -5
x I -∞ -5 1/5 + ∞ I
f(x) I - 0 + 0 -
S= ] - ∞ ; - 5 ] ∪ [ 1/ 5; +∞ [