Վարժ. 114
ա) (x — 9)(x — 2) > 0
(x — 9)(x — 2) = 0
[x — 9 = 0 => [x = 9
[x — 2 = 0 => [x = 2
x€ (-oo;2) U (9;+oo)
բ) (x-8)(x-19) < 0
(x — 8)(x — 19) = 0
[x — 8 = 0 => [x = 8
[x — 19 = 0 => [x = 19
x€ (-oo;8) U (19;+oo)
գ) (x + 3) (x — 5) < 0
(x + 3) (x — 5) = 0
[x + 3 = 0 => [x = -3
[x — 5 = 0 => [x = 5
x€ (-oo;-3) U (5;+oo)
դ) (x — 4 ) (x + 7) >0
(x-4)(x+7) = 0
[x — 4 = 0 => [x = 4
[x + 7 = 0 => [x = -7
x€ (-oo;-7) U (4;+oo)
Դաս 2.
Արփինե Խաչատրյանի բլոգ 