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Sagot :

tu utilises delta = 4 + 12 = 16 
puis x1 =( 2 - V16)/2 = -2/2 = -1
ou x2 =(2 + V16)/2 =6/2 = 3
ou alors tu factorises
x² - 3x + x - 3 = (x² +x) -3(x+1) = x(x+1) - 3(x+1) = (x+1)(x-3) = 0 
règle du produit nul
x+1 = 0 => x = -1
x-3 = 0 > x = 3

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