Sagot :
Bonsoir,
a. (7x - 2)(2 - 3.) + (4x + 3)(7x - 2) = 0
(7x-2) ( 2-3 +4x+3) =0
= (7x-2 ) ( 4x +2) =0
soit 7x-2 = 0
7x= - 2
x= -2/7
soit 4x+2 = 0
4x=-2
x = -2/4
x= -1/2
b. (9x - 4)(-2 + 5x) - (9x - 4)(3x - 5) = 0
(9x-4) ( -2+5x - 3x+5) =0
(9x-4) ( 2x +3)=0
soit
9x-4 =0
9x = 4
x= 4/9
soit
2x+3 = 0
2x= -3
x= -3/2
c. (y + 5)(y – 2) - 6(y + 5) = 0
(y+5) ( y-2 -6) =0
(y+5) ( y-8) = 0
soit
y+5 = 0
y = -5
soit
y-8=0
y = 8
