MATH 1004 Lecture Notes - Lecture 14: Natural Logarithm, Binary Logarithm, Logarithm
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Math1004: 4. 1 exponential and logarithms its inverse is. Note: in general: f (x) = ax a = base, a > 0 x = power or exponent. F (x) = loga x x = f (f (x)) = aloga x (cid:3) = aloga (cid:3) or or x = f (f (x)) = loga ax (cid:3) = loga a (cid:3) Example: solve log2 x = 3, evaluate log3. 3: simplify f (x) = log2, write as power function log 1, solve for x log3( x x + 1 x sin x) 0 < x < 3 f (x) = log4(4x8x2+1), x 0 loga(2x2 x) 2(x2 1) = 0: 4. 2 de nition of euler"s number e = 2. 718281 e = lim n (1 + )n = ea: 4. 3 euler"s exponential function and natural logarithm. Properties of ex ex+y = exey ex = 1 + x + ex y = ex/ey x ex = , lim x2.