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x²-64 ≤ 15²
x²-64 ≤ 225
x² ≤ 225 + 64
x² ≤ 289
x ≤ √289
x ≤ 17
*syarat
x²-64 ≥ 0
x² ≥ 64
x ≥ 8
HP: {8 ≤ x ≤ 17}
maap gak bisa munculin gambarnya, susah juga