(x-2)do 2 +2x-8=(x+4)do 2 +20x-4
(x-2)² + 2x - 8 = (x+4)² + 20x - 4
x² - 4x + 4 + 2x - 8 = x² + 8x + 16 + 20x - 4
-2x - 4 = 28x + 12
-2x - 28x = 12 + 4
-30x = 16
x = 16 : (-30)
x = -16/30
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(x-2)² + 2x - 8 = (x+4)² + 20x - 4
x² - 4x + 4 + 2x - 8 = x² + 8x + 16 + 20x - 4
-2x - 4 = 28x + 12
-2x - 28x = 12 + 4
-30x = 16
x = 16 : (-30)
x = -16/30
(x-2)² + 2x - 8 = (x+4)² + 20x - 4
x² - 4x + 4 + 2x - 8 = x² + 8x + 16 + 20x - 4
-2x - 4 = 28x + 12
-2x - 28x = 12 + 4
-30x = 16
x = 16 : (-30)
x = -16/30