bjr
(3x+8)² - 64
= (3x)² - 2*3x*8 - 64 = 9x² - 48x - 64
= (3x+8)² - 8² = (3x+8+8) (3x+8-8) = 3x(3x+16)
donc résoudre 3x(3x+16) = 0
soit 3x = 0 => x =0
soit 3x+16 = 0 => x = -16/3
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bjr
(3x+8)² - 64
= (3x)² - 2*3x*8 - 64 = 9x² - 48x - 64
= (3x+8)² - 8² = (3x+8+8) (3x+8-8) = 3x(3x+16)
donc résoudre 3x(3x+16) = 0
soit 3x = 0 => x =0
soit 3x+16 = 0 => x = -16/3