Question
Bonjour,pouvez vous m'aider je ne comprend pas ! Merci.
Pour gagner une carte d’adhésion annuelle au Louvre-Lens, Julien doit répondre correctement à toutes les questions. Aidez-le. Question 1 (12 - 3x)(7x + 5) = 0
Question 2 (2x + 3)(4 - x) + 7x (2x + 3) =0
Question 3 x² - 2x + 1 = 0
Question 4 3x²-1=8
Pour gagner une carte d’adhésion annuelle au Louvre-Lens, Julien doit répondre correctement à toutes les questions. Aidez-le. Question 1 (12 - 3x)(7x + 5) = 0
Question 2 (2x + 3)(4 - x) + 7x (2x + 3) =0
Question 3 x² - 2x + 1 = 0
Question 4 3x²-1=8
Asked by: USER1762
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Answer (347)
Question 1 (12 - 3x)(7x + 5) = 0
12-3x = 0
-3x =12
x = 4
Question 2 (2x + 3)(4 - x) + 7x (2x + 3) =0
(2x+3)(4-x+7x) = 0
(2x+3)(6x+4) = 0
2(x+3)(3x+2) = 0
x+3 = 0
x =-3
3x+2 =0
3x = -2
x =-2/3
Question 3 x² - 2x + 1 = 0
(x-1)² = 0
x-1 = 0
x = 1
Question 4 3x²-1=8
3x²-1-8 = 0
3x²-9 = 0
(3x-3)(3x+3) = 0
3x-3 =0
3x =3
x = 1
3x+3 =.
3x =-3
x = -1
12-3x = 0
-3x =12
x = 4
Question 2 (2x + 3)(4 - x) + 7x (2x + 3) =0
(2x+3)(4-x+7x) = 0
(2x+3)(6x+4) = 0
2(x+3)(3x+2) = 0
x+3 = 0
x =-3
3x+2 =0
3x = -2
x =-2/3
Question 3 x² - 2x + 1 = 0
(x-1)² = 0
x-1 = 0
x = 1
Question 4 3x²-1=8
3x²-1-8 = 0
3x²-9 = 0
(3x-3)(3x+3) = 0
3x-3 =0
3x =3
x = 1
3x+3 =.
3x =-3
x = -1