Bonjour;

a)

16x² -8x +1 -( 4x² +16x -x -4)

= 16x² -8x +1 -( 4x² +16x -x -4)

= 16x² -8x +1 - 4x² -16x +x +4

= 12x² -23x +5

b)

(4x-1) ( 4x-1 -x -4)

= (4x-1) ( 3x -5)

c)

(4*0-1) ( 3*0 -5)

= -1*-5 = 5

(4*1-1) ( 3*1 -5)

= 3* -2

= -6

d)

(4x-1) ( 3x -5) = 0

soit

4x-1=0

4x = 1

x= 1/4 = 0,25

soit

3x-5 = 0

3x= 5

x = 5/3