PAULINEDRNT
Answered

Bonjour.
On donne trois expressions: A= (x + 3)(5x - 1) - 5(5x - 1)
B= (4x + 9) + (5 + x)(4x + 9)
C= (x - 7)² + x² - 49

Sagot :

COCO1613

A= 5x^2 +15x -3 -25x +5

A= 5x^2 -11x +2

B= 4x +9 +20x +45 +4x^2 +9x

B= 33x +54 +4x^2

C= 49 + x^2 -49

C= x^2

PS: ^2 signifie au carré