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【正文】 t happen. This means the stuff under the square root must be greater than or equal to zero (math way of saying not negative). Can39。t divide by zero (denominator (bottom) of a fraction can39。Relations And Functions 169。t be zero) 2. You can39。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。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。 2020 by Shawna Haider A relation is a set of ordered pairs. {(2,3), (1,5), (4,2), (9,9), (0,6)} This is a relation The domain is the set of all x values in the relation {(The range is the set of all y values in the relation 1, )}domain = {1,0,2,4,9} These are the x values written in a set from smallest to largest range = {6,2,3,5,9} These are the y values written in a set from smallest to largest Domain (set of all x’s) Range (set of all y’s) 1 2 3 4 5 2 10 8 6 4 A relation assigns the x’s with y’s This relation can be written {(1,6), (2,2), (3,4), (4,8), (5,10)} A func
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