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2014-05-20T08:19:39+07:00
(2x+1)² + 5x +4 < 0
4x² + 4x +1 + 5x +4 < 0
4x² + 9x + 5 < 0
x1 = -1
x2 = - 5/ 4

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2014-05-20T08:23:38+07:00
(2x + 1) kuadrat + (5x) + 4 < 0
4xkuadrat + 9x +5 < 0
4x(x+1)             5(x+1)
(4x+5)               (x+1)

x1 > -5/4

x2 > -1