DĂ©veloppement
D= (12x +3) (2x -7) + (2x-7)²
24x² -84x 6x -21 + ( 4x² -14x -14x +49)
24x² -78x -21 + ( 4x² -28x +49)
24x² -78x -21 +4x² -28x +49
+28x² -106x +21
D = (12x +3) (2x-7) + (+2x-7) (2x-7)
D = (2x-7) (12x +3 +2x -7)
D = (2x -7) (+14x -5)
X = 2
(2x-7) (14x -5)
2 X 2 -7) (14 X2 -5)
(4 - 7 )(28 -5)
-3 X +23 = -99
x = -1
(2x -7) (14x -5)
(2 X -1 -7) ( 14 X -1 -5)
(-2 -7) ( -14 -5)
-9 X -19 = + 171
