bjr
25x² - 16 = (5x)² - 4² = (5x + 4) (5x - 4)
4x - 2 = 3 + 5x
4x - 5x = 3 + 2
x = -5
15,36 cm ² x 1,25² = 24 cm²
(x - 4) (2x + 7) - (3x + 1) (x - 4)
= (x - 4) (2x + 7 - (3x+1))
= (x-4) (-x + 6)
V cylindre = aire base x hauteur / 3
aire base = pi x r² = pi x 3² = 9 pi
volume = 9pi x 8 / 3 = 24 pi cm³ ou 75,36 cm³
