РЕШИТЕ (х²-1)(3х-2х²+5)≥ 0

Question

РЕШИТЕ (х²-1)(3х-2х²+5)≥ 0

Answer 1

X1,2=+-1
-2х²+3x+5=0 (-1)
2х²-3x-5=0
D= 9+4*5*2=49
X3,4= 3+-7 / 4
X3= 3+7/4=5/2=2,5
X4= 3-7/4=-1
 (-∞; -1) U (1; 2,5)