Sagot :
Bonsoir
A = (3y - 2)² - (3y - 2)(5y + 7)
1) Développer et réduire A.
2) Factoriser A.
A = 9y² -12y +4 - (15y² +21y - 10y -14)
A = 9y² -12y +4 -15y² -21y +10y +14
A = -6y² -23y +18
A = (3y-2)(3y-2) - (5y +7)
A = (3y-2)(3y-2-5y-7)
A = (3y-2)(-2y -9)
A = (3y - 2)² - (3y - 2)(5y + 7)
1) Développer et réduire A.
2) Factoriser A.
A = 9y² -12y +4 - (15y² +21y - 10y -14)
A = 9y² -12y +4 -15y² -21y +10y +14
A = -6y² -23y +18
A = (3y-2)(3y-2) - (5y +7)
A = (3y-2)(3y-2-5y-7)
A = (3y-2)(-2y -9)
1) 9y² -12y +4 -15y² -21y +10y +14= -6y²-23y+18
2) (3y-2)(3y-2) - (5y +7)= (3y-2)(3y-2-5y-7)= (3y-2)(-2y -9)
2) (3y-2)(3y-2) - (5y +7)= (3y-2)(3y-2-5y-7)= (3y-2)(-2y -9)