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E^2x + 3e^x - 18 = 0
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E^2x + 3e^x - 18 = 0

User TheSpyCry
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Let e^x = a
a^2 + 3a - 18 = 0
(a - 3)(a + 6) = 0
a = 3, -6
e^x = 3, -6 (rejected as -6 <0)
x = ln3
User David Ruan
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