1. M = (2x+3)² + (2x+3)(7x-2)
M = (2x+3)(2x+3) + (2x+3)(7x-2)
M = 4x² + 6x + 6x + 9 + 14x² - 4x + 21x - 6
M = 18x² + 29x + 3
2. M = (2x+3)² + (2x+3)(7x-2)
M = (2x+3)(2x+3) + (2x+3)(7x-2)
M = (2x+3) (2x + 3 + 7x -2)
M = (2x+3) (9x+1)
3. M = (2x+3) (9x+1)
M = (2*(-4)+3) (9*(-4)+1)
M = (-8+3) (-36+1)
M = 288-8-108+3
M=175
Exercice 4 :
1. N = (x+5)² - (x-5)²
N = x²+2*x*5+5² - (x²-2*x*5+5²)
N= x² + 10x+25 - (x²-10x+25)
N= x² + 10x+25-x²+10x-25
N = 20x
2.a. N = 20*x
N = 20*0
N=0
b. N = 20*x
N=20*1
N=20
c. N=20*x
N= 20 * (-2)
N = -40
