Răspunsuri

2014-06-11T00:58:35+03:00
6x² - 4x+5=0
a=6
b=-4
c=5
Δ=b^2-4ac
Δ=(-4)^2-4*6*5
Δ=16-120
Δ=-104⇒ x_{1,2} ∉R
7x²-9x+2=0
a=7
b=-9
c=2
Δ=b^2-4ac
Δ=81-56
Δ=25
 x_{1,2} =  \frac{-b +-\sqrt{delta} }{2a}  \\  \\ x_{1,2} =  \frac{9 +-5 }{14} \\  \\  x_{1} = \frac{9+5}{14}  \\  \\ x_{1} = \frac{14}{14}  \\  \\ x_{1}=1 \\  \\ x_{2} = \frac{9-5}{14} \\  \\  x_{2} = \frac{4}{14}  \\  \\ x_{2} = \frac{2}{7}
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