bonsoir,
A=5 x+(4 x-1) ²
A = 5 x + 16 x² - 8 x + 1 = 16 x² - 3 x + 1
B=(5 x-3)(5 x+3)-(4 x+2)(-3 x-1)
B = 25 x² - 9 - ( - 12 x - 4 x - 6 x - 2 )
B = 25 x² - 6 + 12 x + 5 x + 6 x + 2
B = 25 x² + 23 x - 4
factoriser chacune des expressions :
C=(x-1)(2+x)+(x+5)(x-1)
C = ( x - 1 ) ( 2 + x + x + 5 )
C = ( x - 1 ) ( 2 x + 7 )
D = 4 x² +4x+1
D = ( 2 x + 1 )²
E= 16 x² -1
E = ( 4 x - 1 ) ( 4 x + 1 )