Bonjour aidez moi silvouplais :) Développer et réduire chaque expression :)

bonjour

c = ( x +1 + x + 6) ( x + 1 - x - 6)
c = ( 2 x + 7) ( - 5) = - 10 x - 35

d = ( 2 x + 1 + 2 x - 1) ( 2 x + 1 - 2 x + 1)
d = ( 4 x ) ( 2) = 8 x

C = (x + 1)² - (x + 6)²
C = (x² + 2 X x X 1 + 1²) - (x² + 2 X x X 6 + 6²)
C = (x² + 2x + 1) - (x² + 12x + 36)
C = x² + 2x + 1 - x² - 12x - 36 
C = - 10x - 35

D = (2x + 1)² - (2x - 1)²
D = [(2x)² + 2 X 2x X 1 + 1²)] - [(2x)² - 2 X 2x X 1 + 1²)]
D = (4x² + 4x + 1) - (4x² - 4x + 1)
D = 4x² + 4x + 1 - 4x² + 4x - 1
D = 8x