Решите неравенство 2x^2-x-1<_0
2x^2 - x - 1 ≤ 0 D = 1 + 4*2*1 = 9 x1 = (1 - 3)/4 x1 = - 1/2 x2 = (1 + 3)/4 x2 = 1 + - + -------------------/////////////////////-------------------------------> -1/2 1 x x ∈ [- 1/2 ; 1]
ответ какой?
x ∈ [- 1/2 ; 1]