Precalc0101to0102-page16

Precalc0101to0102-page16 - (Section 1.1: Functions) 1.1.15...

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(Section 1.1: Functions) 1.1.15 PART I: EVALUATING FUNCTIONS (THE MECHANICS) In practice , we often evaluate a function at an input without finding the domain. We immediately attempt to evaluate the defining expression , such as 3 t + 9 2 t 2 + 20 t below, at the input. As we simplify, if we obtain an expression that is clearly undefined as a real value , we determine that the function value is undefined . Example 17 (Evaluating a Function; Revisiting Example 16) Let gt () = 3 t + 9 2 t 2 + 20 t . Evaluate g 1 , g ± , g 0 , and g ± 4 . § Solution We write: g 1 = 31 + 9 21 2 + 20 1 = 12 22 = 22 = 3 11 WARNING 16 : Your answer must be in
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