函數(shù)概念(參考版)
2024-11-13 06:39本頁面
【正文】 t use. The answer would be: All real numbers x such that x ? those values. ? If there is a square root, the stuff under the square root cannot be negative so set the stuff ?0 and solve. Then answer would be: All real numbers x such that x ? whatever you got when you solved. NOTE: Of course your variable doesn39。t be negative so must be ?0 04 ??xsolve this 4?xSo the answer is: All real numbers x such that x ?4 Summary of How to Find the Domain of a Function ? Look for any fractions or square roots that could cause one of the two illegals to happen. If there aren39。s we use so that the second illegal of square rooting a negative doesn39。t divide by zero. The answer then is: All real numbers x such that x ?2. means does not equal illegal if this is zero Note: There is nothing wrong with the top = 0 just means the fraction = 0 Let39。t create an illegal situation. Find the domain for the following functions: ? ? 12 ?? xxfSince no matter what value you choose for x, you won39。t be zero) 2. You can39。s try a new function ? ? ? ? ? ? 11211 2 ????gFind g(1)+ g(4). ? ? ? ? ? ? 248164244 2 ????????g? ? ? ? 2324141 So ?????? ggThe last thing we need to learn about functions for this section is something about their domain. Recall domain meant Set A which is the set of values you plug in for x. For the functions we will be dealing with, there are two illegals: 1. You can39。 subtraction ? ? 632 2 ??? xxxfFind f (2k). This means to find the function f and instead of having an x in it, put a 2k in it.
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