Question

Решите неравенство:2x^2-7x-9<0

Answer 1

2x^2-7x-9<0
2x^2-7x-9=0
D= 49-4*2*-9=0
D = 121
x1,2 = (7+-11)/4
x_1 = 4,5 x_2 = -1
(x-4,5)(x+1)<0
  -1<x<4,5
(-1;4,5)