exercice 19 svp exercice 27 svp

exercice 19

a =(x-3)(x+4)

pour x =0

a =(0-3)(0+4) = -3*4 = -12

pour x =1

a =(1-3)(1+4) =-2*5 = -10

2/

a =(x-3)(x+4) =x²+4x-3x-12 =x²+x-12

donc oui A= B

EXERCICE 27

a =(4x+3)(2x+5) = 8x²+20x+6x+15 = 8x²+26x+15

pour x = 0

a = (4*0+3)(2*0+5) =3*5 = 15

pour x =1

a =(4*1+3)(2*1+5)= 7*7 = 49