Odpowiedź:
x² + 6 x + 8 = 0
a = 1 b = 6 c = 8
Δ = b² - 4 a*c = 6² - 4*1*8 = 36 - 32 = 4 √Δ = 2
x = [tex]\frac{- b - \sqrt{delty} }{2 a} = \frac{- 6 - 2}{2*1} = - 4[/tex] lub x = [tex]\frac{- b + \sqrt{delty} }{2 a} = \frac{- 6+ 2}{2*1} = - 2[/tex]
Odp. x = - 4 lub x = - 2
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II sposób:
( x + 4)*( x + 2) = 0
x + 4 = 0 lub x + 2 = 0
x = - 4 lub x = - 2
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Odpowiedź:
x² + 6 x + 8 = 0
a = 1 b = 6 c = 8
Δ = b² - 4 a*c = 6² - 4*1*8 = 36 - 32 = 4 √Δ = 2
x = [tex]\frac{- b - \sqrt{delty} }{2 a} = \frac{- 6 - 2}{2*1} = - 4[/tex] lub x = [tex]\frac{- b + \sqrt{delty} }{2 a} = \frac{- 6+ 2}{2*1} = - 2[/tex]
Odp. x = - 4 lub x = - 2
=======================
II sposób:
x² + 6 x + 8 = 0
( x + 4)*( x + 2) = 0
x + 4 = 0 lub x + 2 = 0
x = - 4 lub x = - 2
=======================
Szczegółowe wyjaśnienie: