le 129 et 130 svp urgent

Bonsoir,

129)


a.
5x (3x + 8)
= 15x² + 40x

b.
- 4y (y + 3)
= - 4y² - 12y

c.
- 2t (- 3t - 7)
= 6t² - 14²

130)

a.
(x + 1) (x + 4)
= x² + 4x + x + 4
= x² + 5x + 4

b.
(y - 1) (y + 3)
= y² + 3y - y - 3
= y² + 2y - 3

c.
(7t + 8) (4 - 3t)
= 28t - 21t² + 32 - 23t
= - 21t² + 28t - 23t + 32
= - 21t² + 5t + 32