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Rezolvati excuatia x

Rezolvati Excuatia X class=

Răspuns :

3x^2 - 2x - 1 = 0 
d. = 4 - 4 x (-1) x 3 = 4 + 12 = 16 
x1 =  2 + 4 / 6 = 6/6 = 1 
x2 = 2 - 4 / 6 = - 2/6 = -0,(3) 

S = { 1}  
3x^2 -2x-1=0
a=3
b=-2 => Delta= b^2-4ac= 16
c=-1

x1; x2 = -b+/- radical delta/ 2a => x1= 2+4/6=1
=> x2= 2-4/6=-1/3