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(3ˣ)²/3ˣ + 3³/3ˣ - 28.3ˣ/3ˣ = 0
(3ˣ)² + 3³ - 28(3ˣ) = 0
misal 3ˣ = a
a² - 28a + 27 = 0
(a - 27)(a - 1) = 0
a₁ = 27 a₂ = 1
3ˣ = 27 3ˣ = 1
3ˣ = 3³ 3ˣ = 3⁰
x = 3 x = 0