Bonjour
D= ( 2 + 3y ) - ( 1 - 4y ) = 2+3y -1+4y =
7y +1
Pour y = 3,1
7*3,1 + 1 = 21,7 + 1 = 22,7
E= ( 3x² - 7x - 9 ) - ( x² - 4x + 3 )
= 3x^2 -7x -9 -x^2 + 4x -3
= 2x^2 -3x -12
calculer x = 5
2(5)^2 -3 (5) -12
2(25) -15 -12
50-27
23
Exercice 2 :
Factoriser :
F= 12 + 6x² = 6 (2 + x^2)
G= 16x - 4 = 4(4x-1)
H= 8a² + 10a = 2a(4a +5)
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Bonjour
D= ( 2 + 3y ) - ( 1 - 4y ) = 2+3y -1+4y =
7y +1
Pour y = 3,1
7*3,1 + 1 = 21,7 + 1 = 22,7
E= ( 3x² - 7x - 9 ) - ( x² - 4x + 3 )
= 3x^2 -7x -9 -x^2 + 4x -3
= 2x^2 -3x -12
calculer x = 5
2(5)^2 -3 (5) -12
2(25) -15 -12
50-27
23
Exercice 2 :
Factoriser :
F= 12 + 6x² = 6 (2 + x^2)
G= 16x - 4 = 4(4x-1)
H= 8a² + 10a = 2a(4a +5)