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x²-8x+15 < 9 ; x ≤ 3 atau x ≥ 5
x²-8x+6 < 0
x²-8x+16 < 10
(x-4)² < 10
x-4 < √10 atau x-4 > -√10
x < 4+√10 atau x > 4-√10
4-√10 < x < 4+√10 ; x ≤ 3 atau x ≥ 5
maka: 4-√10 < x ≤ 3 atau 5 ≤ x < 4+√10