Sagot :
e=3(3y+4)
f=x(x+5)
g=(x+1)[(x+1)-2]
=(x+1)(x-1)
h=(2t+1)(t-7+2t+1)
=(2t+1)(3t-6)
A=(x+2)[(2x-1)+(3x+2)] A=(x+2)(5x+1) B=(x-7)[(5x-3)-(2x+4)]
B= (x-7) (3x-7)
Factorise A par (x+2) puis réduis
A=(x+2)(2x-1)+(x+2)(3x+2)
A= (x+2) (2x -1 +3x +2)
A= (x+2) (5x +1)
B=(5x-3)(x-7)-(2x+4)(x-7)
B=(x-7)(5x-3 -2x -4)
B= (x-7) ( 3x -7)
e=9y+12
e= 3(3y+4)
f=x²+5x
f=x(x+5)
g=(x+1)²-2(x+1)
g= (x+1)(x+1 -2)
g=(x+1) (x -1) ou g =x² -1
h=(t-7)(2t+1)+(2t+1)²
h= (2t+1)(t-7 +2t +1)
h= ( 2t +1)( 3t -6 )