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Stitz-Zeager_College_Algebra_e-book

# 8 x 1 log2 4 log 3 100x2 yz 5 2 log01 10x2 3 ln 3 ex

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Unformatted text preview: −2 is not a real number. In general, if x is any rational number with an even denominator, then (−2)x is not deﬁned, so we must restrict our attention to bases b ≥ 0. What about b = 0? The function f (x) = 0x is undeﬁned for x ≤ 0 because we cannot divide by 0 and 00 is an indeterminant form. For x > 0, 0x = 0 so the function f (x) = 0x is the same as the function f (x) = 0, x > 0. We know everything we can possibly know about this function, so we exclude it from our investigations. The only other base we exclude is b = 1, since the function f (x) = 1x = 1 is, once again, a function we have already studied. We are now ready for our deﬁnition of exponential functions. Definition 6.1. A function of the form f (x) = bx where b is a ﬁxed real number, b > 0, b = 1 is called a base b exponential function. We leave it to the reader to verify6 that if b > 1, then the exponential function f (x) = bx will share x the same basic shape and characteristics as f (x) = 2x . What if 0 < b < 1? Consider g (x) = 1 . 2 We could...
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