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9x²+12x=-4
???Cum se face?


Răspuns :

9x²+12x=-4
9x^2+12x+4=0
a=9
b=12
c=4

delta=b^2-4ac
delta=12^2-4*9*4
delta=144-144
delta=0 => va exista doar o singura sulutie x1=x2

x1=-b-radical din delta/2a
x1=-12-0/2*9
x1=-12/18
x1=-6/9
x1=-2/3
x1=x1=-2/3 solutie unica