Dvelopper et rduire x 5x 1 3 x

Développer et réduire (x – 5)(x + 1) = (3 + x) x =

Calcul 1 (3 x – 1) x =

Calcul 2 (x – 1)(x + 5) =

Calcul 3 (-x – 7) x =

Calcul 4 (x – 3)(x – 5) =

Calcul 5 (x – 5)(x + 5) =

Prêt pour la correction…

Calcul 1 (3 x – 1) x

Calcul 1 (3 x – 1) x = 3 x x x – 1 x x

Calcul 1 (3 x – 1) x = 3 x x x – 1 x x = 3 x² – x

Calcul 2 (x – 1)(x + 5)

Calcul 2 (x – 1)(x + 5) =xxx+xx 5– 1 xx– 1 x 5

Calcul 2 (x – 1)(x + 5) =xxx+xx 5– 1 xx– 1 x 5 = x² + 5 x – 5

Calcul 2 (x – 1)(x + 5) =xxx+xx 5– 1 xx– 1 x 5 = x² + 5 x – 5 = x² + 4 x – 5

Calcul 3 (-x – 7) x

Calcul 3 (-x – 7) x = -x x x – 7 x x

Calcul 3 (-x – 7) x = -x x x – 7 x x = -x² – 7 x

Calcul 4 (x – 3)(x - 5)

Calcul 4 (x – 3)(x - 5) =xxx–xx 5– 3 xx+3 x 5

Calcul 4 (x – 3)(x - 5) =xxx–xx 5– 3 xx+3 x 5 = x² – 5 x – 3 x + 15

Calcul 4 (x – 3)(x - 5) =xxx–xx 5– 3 xx+3 x 5 = x² – 5 x – 3 x + 15 = x² – 8 x + 15

Calcul 5 (x – 5)(x + 5)

Calcul 5 (x – 5)(x + 5) =xxx+xx 5– 5 xx– 5 x 5

Calcul 5 (x – 5)(x + 5) =xxx+xx 5– 5 xx– 5 x 5 = x² + 5 x – 25

Calcul 5 (x – 5)(x + 5) =xxx+xx 5– 5 xx– 5 x 5 = x² + 5 x – 25 = x² – 25