(Section 1.1: Functions)1.1.15 PART I: EVALUATING FUNCTIONS (THE MECHANICS)In practice, we often evaluatea function at an input without finding the domain. We immediately attempt to evaluate the defining expression, such as 3t+92t2+20tbelow, 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()=3t+92t2+20t. Evaluate g1, g±, g0, and g±4. § SolutionWe write: g1=31+9212+20 1=1222=22=311WARNING 16: Your answer must be in
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