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Verified answer
X^2 < |2x - 15|(x^2)^2 < (2x - 15)^2
(x^2)^2 - (2x - 15)^2 < 0
(x^2 + (2x - 15))(x^2 - (2x - 15)) < 0
(x^2 + 2x - 15)(x^2 - 2x + 15) < 0 => x^2 - 2x + 15 definit positif Krn D < 0
(x + 5)(x - 3). + < 0
x = -5 atau x = 3
Garis bilangan
+++ (-5) --- (3) +++
-5 < x < 3
Pertidaksamaan Mutlak
Pembahasan :
x² < |2x - 15|
x² < 2x - 15
x² < 2x - 15
x² - 2x + 15 < 0
Definit positif D < 0 dan a > 0
x² > -(2x - 15)
x² > -2x + 15
x² + 2x - 15 > 0
(x + 5)(x - 3) > 0
Hp : {x < -5 atau x > 3, x € R}