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(1/5)'log (x+1)(x-3) ≤ (1/5)'log (1/5)^-1
(x+1)(x-3) ≥ 5 dengan pembatas x + 1 > 0 n x - 3 > 0 --> x > 3
x^2 - 2x - 3 - 5 ≥ 0
x^2 - 2x - 8 ≥ 0
(x -4)(x+1) ≥ 0
x ≥ 4 atau x ≤ -1 (TM)
HP x ≥ 4
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 atau x ≥ 4.
Lalu ditambah, syarat batas
x + 1 > 0
x > -1
dan
x - 3 > 0
x > 3
∴ maka HP = {x ≥ 4}