Sagot :
bonjour
A = x ( x + 2 ) = x * x + x * 2 = x² + 2 x
B = 3 x ( x + 4 )= 3 x * x + 3 x * 4 = 3 x² + 12 x
C = 2 x ( 3 - x ) = 2 x * 3 - 2 x * x = 6 x - 2 x²
Réponse :
bonjour
Explications étape par étape :
A = X(X +2) =
=x*x+x*2=x²+2x
B = 3X (X + 4 ) = 3X ×.... + 3X ×.... = .... + ....
=3x*x+3x*4=3x²+12x
C = 2X (3 moins X ) = 2X ×....moins ..... × X = .... moins ......
=2x*3 - 2x*x = 6x-2x²