Réponse :
->
Explications étape par étape :
A = 12x - 3x - 45
= 9x - 45
= x - 5
B = 4x - 18 + 21x + 14
= 25x - 4
C = 2x^2 - 4x^2 + 5x
= -2x^2 + 5x
D = 4x^2 - x + 5x^2 - 9x
= 9x^2 - 10x
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Réponse :
->
Explications étape par étape :
A = 12x - 3x - 45
= 9x - 45
= x - 5
B = 4x - 18 + 21x + 14
= 25x - 4
C = 2x^2 - 4x^2 + 5x
= -2x^2 + 5x
D = 4x^2 - x + 5x^2 - 9x
= 9x^2 - 10x