Sagot :
a) (4x-3)²-(4x+3)²
16x²-24x+9-16x²-24x-9
-48x
b) (1/2x-1/3)²
1/4x²-1/3x+1/9
c)(2x+5)(-4x+3)
-8x²+6x-20x+15
-8x²-14x+15
d) (-x+2)(2x-7)
-2x²+7x+4x-14
-2x²+11x-14
16x²-24x+9-16x²-24x-9
-48x
b) (1/2x-1/3)²
1/4x²-1/3x+1/9
c)(2x+5)(-4x+3)
-8x²+6x-20x+15
-8x²-14x+15
d) (-x+2)(2x-7)
-2x²+7x+4x-14
-2x²+11x-14
a) (4x - 3)² - (4x + 3)²
16x² - 24x + 9 - 16x² - 24x -9
-48x
b) (1/2x - 1/3)²
1/4x² - 1/3x + 1/9
c) (2x + 5) (-4x + 3)
-8x² + 6x - 20x + 15
-8x² - 14x + 15
d) (-x + 2) (2x -7)
-2x² + 7x + 4x -14
-2x² + 11x - 14
16x² - 24x + 9 - 16x² - 24x -9
-48x
b) (1/2x - 1/3)²
1/4x² - 1/3x + 1/9
c) (2x + 5) (-4x + 3)
-8x² + 6x - 20x + 15
-8x² - 14x + 15
d) (-x + 2) (2x -7)
-2x² + 7x + 4x -14
-2x² + 11x - 14