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2². 2⁻²ˣ - 9. 2⁻ˣ + 2 > 0
4 . (2⁻ˣ)² - 9 (2⁻ˣ) + 2 > 0
misalkan 2⁻ˣ - a
4a² - 9a + 2 > 0
(4a - 1)(a - 2) > 0
a < 1/4 atau a > 2
untuk a < 1/4
2⁻ˣ < 1/4
2⁻ˣ < 2⁻²
-x < - 2
x > 2
untuk a > 2
2⁻ˣ > 2
2⁻ˣ> 2¹
-x > 1
x < -1
HP x < -1 atau x > 2