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cum se rezolva X la putera2 +X-2=0

Răspuns :

HawkEyed
x^2 + x - 2 = 0 
d. = 1 + 8 = 9 
x1 = -1 + 3 / 2 = 2/2 = 1 
x2 = -1 - 3/2 = -4/2 = -2 

S = { -2; 1}
Marianalin
x²+x-2=0
a=1
b=1
c=-2
Δ=b²-4·a·c
Δ=1²-4·1·(-2)
Δ=1+8
Δ=9
x1=-b+√Δ/2a
x1=-1+√9/2
x1=-1+3/2
x1=2/2
x1=1
x2=-b-√Δ/2a
x2=-1-√9/2
x2=-1-3/2
x2=-4/2
x2=-2

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