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a fost răspuns

Cum rezolv x^2-x-2
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Răspuns :

x^2-x-2=0
delta=b^2-4ac=1+8=9
x1,2=(-b+-radical din delta)/2a=> x1= (1+3)/2=2 si x2= (1-3)/2=-1
SignOfTheTimes
Salut,

x²-x-2 = 0.

a = 1
b = -1
c = -2

∆ = b²-4ac
∆ = 1²-4•1•(-2)
∆ = 1+8
∆ = 9.


x1 = (-b-√∆)/2a
x1 = (1-3)/2
x1 = -2/2
x1 = -1.

x2 = (-b+√∆)/2a
x2 = (1+3)/2
x2 = 4/2
x2 = 2.


a(x-x1)(x-x2) = (x+1)(x-2).


S = {-1;2}.



Succes!

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