Réponse:
G = X [ (7X) x (-3X) + (-2) x (+ 4)]
= X [ - 21 X² - 8]
= X x (- 21X²) - X x 8
= - 21 X³ - 8 X
H = 5( 7Y + 3)²
= 5[ (7Y + 3) x( 7Y + 3)]
= 5[ 49 Y² + 9]
= 245 Y² + 45
I = (10Z + Racine 3) x ( 10Z - Racine 3)
= 100Z² - Racine 9
= 100Z² - 3
remarque: vous écrivez Racine en symbole pas en lettre
J = (6 t⁵ - 8)²
= ( 6t⁵ - 8) x ( 6t⁵ - 8)
= (6t⁵ x 6t⁵) + ( - 8 x - 8 )
= 36t²⁵ + ( + 64)
= 36t²⁵ + 64
bon courage !
