Ответы и объяснения

2012-05-22T13:50:57+00:00

4x2 + 3x - 1 < 0
D = b2 - 4ac
D = 9 + 16 = 25 = 5^2

x1,2 = -b ± √D/2a
x1 = -3 + 5/8 = 2/8 = 1/4
x2 = -3 - 5/8 = - 8/8 = -1
Ответ: x1 = 1 ; x2 = -1

(-1;1)