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x^2 < (2x - 15)^2
x^2 < 4x^2 - 60x + 225
x^2 - 4x^2 + 60x - 225 < 0
-3x^2 + 60x - 225 < 0
3x^2 - 60x + 225 > 0
(3x - 45)(x - 5) > 0
3x - 45 = 0
x = 45/3
x = 15
atau
x - 5 = 0
x = 5
HP = {x | x < 5 atau x > 15}