Sagot :

Teamce

Bonsoir,

Factoriser:

C = 5x² + 15x

C = 5x*x² + 5x*3

C = 5x(x² + 3)

D = (2x - 3)² - (1 - x)(2x - 3)

D = (2x - 3)(2x - 3) - (1 - x)(2x - 3)

D = (2x - 3)(2x - 3 - (1 - x))

D = (2x - 3)(2x - 3 - 1 + x)

D = (2x - 3)(3x - 4)

E = x² - 14x + 49 <=> x² - 2*x*7 + 7²

→ identité remarquable :

  • a² - 2ab + b² = (a - b)²

E = (x - 7)²

F = (3x + 5)² - (x - 8)²

→ identité remarquable :

  • a² - b² = (a - b)(a + b)

F = (3x + 5 - (x - 8))(3x + 5 + (x - 8))

F = (3x + 5 - x + 8)(3x + 5 + x - 8)

F = (2x + 13)(4x - 3)

* = multiplication

Bonne soirée.