Sagot :
Réponse :
A = (4x-1)(4x-9) - 3(9x-1)
= (16x^2 - 4x - 36x + 9) - 27x + 3 (Parce (4x-1)(4x-9) = (4x*4x) - 4.(1 + 9)x + 9*4)
= 16x^2 - 40x + 9 - 27x + 3
= 16x^2 - 67x + 12
Voilà
Réponse :
A = (4x-1)(4x-9) - 3(9x-1)
= (16x^2 - 4x - 36x + 9) - 27x + 3 (Parce (4x-1)(4x-9) = (4x*4x) - 4.(1 + 9)x + 9*4)
= 16x^2 - 40x + 9 - 27x + 3
= 16x^2 - 67x + 12
Voilà