Robert J. answered • 03/02/13
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Certified High School AP Calculus and Physics Teacher
Let u = e^x
u + 49/u = 14
u^2 - 14u + 49 = (u-7)^2 = 0
u = 7
e^x = 7
x = ln(7) <==Answer
Jackie B.
asked • 03/02/13Solve (e^x + 49e^-x)/2 = 7
this is a fraction
(e^x + 49 e^-x) / 2 =7
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Brian B.
Robert...great answer....clear, common algebraic concepts used to simplify a complex looking question.
03/02/13