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bonjour

3 x² - x² = 0

2 x² = 0

x = 0

2 x² - 2 x - 24 = 0

Δ = 4 - 4 ( 2 * - 24 ) = 4 + 192 = 196

x 1 = ( 2 - 14 ) / 4 = - 12 /4 = - 3

x 2 =  ( 2 + 14 ) / 4 = 16 /4 = 4

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