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Nuuutella
@Nuuutella
May 2019
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Bonjour, quelqu'un peut m'aider ?
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loulakar
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Bonjour,
Exercice 2 :
B = 25(3x + 4)^2 - (x - 7)^2
B = 25(9x^2 + 24x + 16) - x^2 + 14x - 49
B = 225x^2 + 600x + 400 - x^2 + 14x - 49
B = 224x^2 + 614x + 351
25x^2 = (5x)^2
B = [5(3x + 4) - x + 7][5(3x + 4) + x - 7]
B = (15x + 20 - x + 7)(15x + 20 + x - 7)
B = (14x + 27)(16x + 13)
Développer et réduire :
B = 224x^2 + 182x + 432x + 351
B = 224x^2 + 614x + 351
1)a) La surface jaune
b) A = 25 - (x + 3)^2
A = 25 - x^2 - 6x - 9
A = -x^2 - 6x + 16
c) A = 5^2 - (x + 3)^2
A = (5 - x - 3)(5 + x + 3)
A = (-x + 2)(x + 8)
d) x = V2
A = -(V2)^2 - 6V2 + 16
A = -4 + 16 - 6V2
A = 12 - 6V2
A = 3,51
e) x = 2
A = -(2)^2 - 6 * 2 + 16
A = -4 - 12 + 16
A = 0
C’était prévisible car (x + 3) = 2 + 3 = 5
Et 5^2 = 25 donc 25 - 25 = 0
2)a) aire de F :
F = 5 * 5 - (x * x + 3 * 3)
F = 25 - x^2 - 9
F = 16 - x^2
b) F = 4^2 - x^2
F = (4 - x)(4 + x)
c) x = 4
F = (4 - 4)(4 + 4)
F = 0
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Bonjour, quelqu'un peux m'aider s'il vous plait ?
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Bonjour,Exercice 2 :
B = 25(3x + 4)^2 - (x - 7)^2
B = 25(9x^2 + 24x + 16) - x^2 + 14x - 49
B = 225x^2 + 600x + 400 - x^2 + 14x - 49
B = 224x^2 + 614x + 351
25x^2 = (5x)^2
B = [5(3x + 4) - x + 7][5(3x + 4) + x - 7]
B = (15x + 20 - x + 7)(15x + 20 + x - 7)
B = (14x + 27)(16x + 13)
Développer et réduire :
B = 224x^2 + 182x + 432x + 351
B = 224x^2 + 614x + 351
1)a) La surface jaune
b) A = 25 - (x + 3)^2
A = 25 - x^2 - 6x - 9
A = -x^2 - 6x + 16
c) A = 5^2 - (x + 3)^2
A = (5 - x - 3)(5 + x + 3)
A = (-x + 2)(x + 8)
d) x = V2
A = -(V2)^2 - 6V2 + 16
A = -4 + 16 - 6V2
A = 12 - 6V2
A = 3,51
e) x = 2
A = -(2)^2 - 6 * 2 + 16
A = -4 - 12 + 16
A = 0
C’était prévisible car (x + 3) = 2 + 3 = 5
Et 5^2 = 25 donc 25 - 25 = 0
2)a) aire de F :
F = 5 * 5 - (x * x + 3 * 3)
F = 25 - x^2 - 9
F = 16 - x^2
b) F = 4^2 - x^2
F = (4 - x)(4 + x)
c) x = 4
F = (4 - 4)(4 + 4)
F = 0