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⁰'²log [(x+1)(x-3)] ≤ -1
(x+1)(x-3) ≤ (1/5)⁻¹
(x+1)(x-3) ≤ 5
x² - 2x - 3 ≤ 5
x² - 2x - 8 ≤ 0
(x - 4)(x+2) ≤ 0
-2 ≤ x ≤ 4.
Lalu ditambah, syarat batas
x + 1 > 0
x > -1
dan
x - 3 > 0
x > 3
∴ maka HP = {3 < x < 4}