Bonjour,
D= (y – 5)(y - 2)
double distributivité:
y*y =y²
y*-2 = -2y
-5 * y = -5y
-5 *-2 = 10
=>
y² -7y +10
D=(y-5)(y-2)
D=(y×y)-(y×2)-(5×y)+(5×2)
D=y^2-2y-5y+10
D=y^2-7y+10
Il faut appliquer la distributivité
