Sagot :
a) (4x-3)² - (x+2)²
=16x²-24x+9-(x²+4x+4)
=16x²-24x+9-x²-4x-4
=15x²-28x+5
b) (2x-1)(x+3)(x+1)
=(2x²+6x-x-3)(x+1)
=2x³+6x²-x²-3x+2x²+6x-x-3
=2x³+7x²+2x-3
=16x²-24x+9-(x²+4x+4)
=16x²-24x+9-x²-4x-4
=15x²-28x+5
b) (2x-1)(x+3)(x+1)
=(2x²+6x-x-3)(x+1)
=2x³+6x²-x²-3x+2x²+6x-x-3
=2x³+7x²+2x-3
a)
(4x - 3)² - (x + 2)²
16x² - 24x + 9 - (x² + 4x + 4)
16x² - 24x + 9 - x² - 4x -4
15x² - 28x + 5
b)
(2x - 1) (x + 3) (x + 1)
(2x² + 6x - x - 3) (x + 1)
2x³ + 6x² - x² - 3x + 2x² + 6x - x - 3
2x³ + 7x² + 2x - 3
(4x - 3)² - (x + 2)²
16x² - 24x + 9 - (x² + 4x + 4)
16x² - 24x + 9 - x² - 4x -4
15x² - 28x + 5
b)
(2x - 1) (x + 3) (x + 1)
(2x² + 6x - x - 3) (x + 1)
2x³ + 6x² - x² - 3x + 2x² + 6x - x - 3
2x³ + 7x² + 2x - 3