Réponse:
Salut!
Explications étape par étape:
R = (x + 4)^2 – 49
R = (x + 4)^2 – 7^2
R = (x+4 -7) ( x+4+7)
R= (-3 +x ) (11+ x )
S = (x – 4)^2 – (2x - 1)^2
a^2 - b^2 a = x-4 b = 2x-1
S = (x – 4)^2 – (2x - 1)^2
S= (x-4 -2x-1) ( x-4+2x-1)
S= (-x -5) ( -5 +3x)
T = 4 – (1 – 3x)^2
T = 2^2 - (1 – 3x)^2
T = (2-1-3x) (2+1-3x)
T= ( -1 -3x) ( 3-3x)
Voilà bonne journée !