bonjour je suis au lycée SVP pouvez vous m'aider car j'ai rien compris faut factoriser les expressions suivante: A = x (2x + 1) + 2x (x + 3) B = (x + 3) x + (3

bjr

A = x (2x + 1) + 2x (x + 3)

à part x en facteur commun je ne vois pas

A = x [(2x+1) + 2(x+3)]

A = x (2x + 1 + 2x + 6)

A = x (4x +7)

B = (x + 3) x + (3 + x) (x + 1)

  = (x + 3) x + (x + 3) (x + 1)

  = (x + 3) (x + (x+1))

  = (x + 3) (2x +1 )

C = (x + 1) (1 + 2x)² + (2x + 1) (x + 1)²

  = (x + 1) (2x + 1) (2x + 1) + (2x + 1 ) (x + 1) (x + 1)

  = (x + 1) (2x + 1) (2x+1 + (x+1))

  = (x + 1) (2x + 1) (3x + 2)

Salut

[tex]\rule{6cm}{1mm}[/tex]

A = x(2x + 1) + 2x(x + 3)

A = x(7 + 2 * 2x)

A = x(7 + 4x)

B = (x + 3)x + (3 + x)(x + 1)

B = (x + 3)[x + (x + 1)]

B = (x + 3)(x + x + 1)

B = (x + 3)(2x + 1)

C = (x + 1)(1x  +2x)² + (2x + 1)(x  +1)²

C = [(x + 1)(1x + 2x)][(1x + 2x) + (x + 1)]

C = (x² + 2x²+ x + 2x)(1x + 2x + x + 1)

C = (3x² + 3x)(4x + 1)