RĂ©ponse :
Explications Ă©tape par Ă©tape
25-16x² = 5² - (4x)² = (5+4x)(5-4x)
(x+5)² - 16² = (x+5)² - 4² = ( (x+5) + 4)( (x+5) - 4) = (x+9)(x+1)
(2x-3)² - 5 = [tex](2x-3)^2 - (\sqrt 5)^2 = (2x-3+\sqrt5)(2x-3-\sqrt5)\\[/tex]
25-(x+2)²= (5+x+2)(5-(x+2)) = (x+7)(3-x)
x² - 3 = [tex](x+\sqrt3)(x-\sqrt3)[/tex]
(2x+3)² - (x-2)² = ( (2x+3) + (x-2) ) ( (2x+3) - (x-2) ) = (3x+1)(x+5)
-4+x² = x²-4 = (x+2)(x-2)
