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DAU COROANA !!
Indicati coeficientii a,b si termenul liber c ai ecuatiei:
a)3x² - 4x - 4 = 0
b)5x² + 3x = 0
c)x² - x - 2 = 0


Răspuns :

a)[tex]3 x^{2} -4x-4=0 [/tex]  a=3 b=-4 c=-4   Δ =b²-4ac Δ=16+48 =64      x1 = [tex] \frac{4+8}{6 } = \frac{12}{6} = 2 [/tex]   x2= [tex] \frac{4-8}{6} = \frac{-4}{6} = \frac{-2}{3} [/tex]        b)5x²+3x=0 Δ=b²-4ac  Δ = 9-0 = 9   x1= [tex] \frac{-3+3}{10} = 0 [/tex]   si x2= [tex] \frac{-3-3}{10} = \frac{-6}{10 } = \frac{-3}{5} [/tex]   c) x²-x-2 =0  Δ=b²-4ac Δ = 1+8 = 9   x1 =[tex] \frac{1+3}{2} = \frac{4}{2} =2 [/tex]  si x2 = [tex] \frac{1-3}{2} = \frac{-2}{2} = -1[/tex]