Répondre :
je vais t'aider
(2x-5) - (4x-2)
equivalent a (2x-5)^2=(4x-2)^2
4x^2-20x+25=16x^2 -16x+4
4x^2-16x^2-20x+16x+25-4=0
-12x^2 -4x +21 =0
(2x-5) - (4x-2)
equivalent a (2x-5)^2=(4x-2)^2
4x^2-20x+25=16x^2 -16x+4
4x^2-16x^2-20x+16x+25-4=0
-12x^2 -4x +21 =0