Réponse:
(3x+9)^2 + (4x+12)^2=(5x+15)^2
Explications étape par étape:
(3x+9)^2+(4x+12)^2=9x^2+54x+81+16x^2+96x+144=25x^2+150x+225=(5x)^2+2×5×15x+15^2=(5x+15)^2
[tex](3x+9)^2+(4x+12)^2=9x^2+54x+81+16x^2+96x+144=25x^2+150x+225=(5x)^2+2×5×15x+15^2=(5x+15)^2[/tex]
d apres me théorème de Pythagore on a que ce truangle est rectangle.
