Réponses

  • Utilisateur Brainly
2014-02-05T19:04:43+01:00
A= (3x+4)(7x-3) + (7x-3)²
A= 21x²-9x+28x-12+49x²-42x+9
A= 70x²-23x-3

B= (4z-2)²-(4z+1)(6z-5)
B= 16z²-16z+4 - (24z²-20z+6z-5)
B= 16z²-16z+4-24z+20z-6z+5
B= -8z²-26x+9

C= (4m-5)²-(3m+1)²
C= 16m²-40m+25-(9m²+6m+1)
C= 16m²-40m+25-9m²-6m-1
C= 7m²-46m+24