slt svp aidez moi je dois rendre demain​

Bonsoir,

D= 4x² -8x +4 -(6x² -6x +14x -14)

= 4x² -8x +4 -6x² +6x -14x +14

=-2x² -16x +18

factoriser:

(2x-2) ( 2x-2 -3x -7)

=  (2x-2) ( -x -9)

D= 0

(2x-2) ( -x -9)  =0

soit

2x-2 =0

2x =2

x= 2/2

x = 1

soit

-x-9= 0

-x = 9

x= -9

x= 1

(2x-2) ( -x -9)

(2*1 -2) (-1 -9)

= (2-2 ) ( -10)

0*-10

= 0