Sagot :
Réponse:
J = (x + 7)(3 - 2x) + (5x - 2)(4x + 1)
J = 3x -2x² +21 -14x + 20x² +5x - 8x -2
J = 18x² -14x + 19
K = (5x - 2)(5x - 8) - (3x - 5)(x + 7)
K = (25x² -40x -10x + 16 ) - ( 3x² + 21x -5x - 35)
K = 25x² - 40x -10x +16 - 3x² -21x +5x+35
k = 22x² -66x + 51
H = (2x - 5) ² - (4x + 1)²
H = (( 2x) ²- 2×2x×5 + 5²) - ((4x)²+2×4x×1 +1²)
H = (4x² - 20x + 25) - (16x² + 8x +1)
H = 4x²-20x + 25 - 16x² - 8x -1
H = -12x² -28x + 24
Réponse :
On développe et réduit les équations suivantes;
J = (x + 7)(3 - 2x) + (5x - 2)(4x + 1)
J =(3x -2x² +21 -14x + 20x² +5x -8x -2
J = 18x² -14x + 19
K = (5x - 2)(5x - 8) - (3x - 5)(x + 7)
K = 25x² -40x -10x +16 -(3x² +21x -5x -35)
K = 25x² -50x +16 -3x² -21x + 5x +35
K = 22x² -66x +51
H = (2x - 5)² - (4x + 1)²
H= 4x² -20x +25 -(16x² +8x + 1)
H = 4x² -20x + 25 -16x² -8x -1
H = -12x² -28x + 24