Répondre :
ex 1 :
H= (x+1)²
=x²+1*2*x+1²
=x²+2x+1
ex 2 :
L= (3y-5)(2y+1)+(y-7)(15-9y)
L = (3y-5)(2y+1)+(y-7)(5-3y)
L=(5-3y)[(2y+1)+(y-7)]
L=(5-3y)[2y+1+y-7]
L=(5-3y)[3y-6]
S= (2t-3)(3t+4)-(t-5)(3-2t)
S= (2t-3)[(3t+4)-(t-5)]
S= (2t-3)[3t+4-t+5]
S= (2t-3)[2t+9]
H= (x+1)²
=x²+1*2*x+1²
=x²+2x+1
ex 2 :
L= (3y-5)(2y+1)+(y-7)(15-9y)
L = (3y-5)(2y+1)+(y-7)(5-3y)
L=(5-3y)[(2y+1)+(y-7)]
L=(5-3y)[2y+1+y-7]
L=(5-3y)[3y-6]
S= (2t-3)(3t+4)-(t-5)(3-2t)
S= (2t-3)[(3t+4)-(t-5)]
S= (2t-3)[3t+4-t+5]
S= (2t-3)[2t+9]