" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
x² - 2x - 15 ≥ 0
(x - 5) (x + 3) ≥ 0
x ≤ -3 atau x ≥ 5
kuadratkan kedua ruas
x² - 2x - 15 < (x - 3)²
x² - 2x - 15 < x² - 6x + 9
4x - 24 < 0
4x < 24
x < 6
jadi x yang memenuhi yaitu 5 ≤ x < 6