Bonjour,
A = (x - 3/7)(7x - 14)
A = x*7x - x*14 - (3/7)*7x + 14*(3/7)
A = 7x² - 14x - 3x + [tex]\frac{2*7*3}{7*1}[/tex]
A = 7x² - 17x + 6
B = (3 + 3/8 * x)(8 - x)
B = 3*8 - 3*x + (3/8)*x*8 - (3/8)*x*x
B = 24 - 3x + 3x - (3/8)x²
B = 24 - (3/8)x²
Pour x = 0:
A = 7*0² - 17*0 + 6
A = 0 - 0 + 6
A= 0
B = 24 - (3/8)*0²
B = 24 - 0
B = 24
Pour x = 1:
A = 7*1² - 17*1 + 6
A = 7 - 17 + 6
A = -10 + 6
A = -4
B = 24 - (3/8)*1²
B = 24 - 3/8
B = [tex]\frac{24}{1}-\frac{3}{8}[/tex]
B = [tex]\frac{192}{8}-\frac{3}{8}[/tex]
B = [tex]\frac{189}{8}[/tex]
Bonne journée
