【正文】 t be dividing by zero or square rooting a negative number, you can use anything you want so we say the answer is: All real numbers x. ? ?23???xxxgIf you choose x = 2, the denominator will be 2 – 2 = 0 which is illegal because 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. So let’s take the function above and make parenthesis everywhere the x was and in its place, put in a 2k. ? ? ? ? ? ? 623222 2 ??? kkkf? ? ? ? ? ? 668623422 22 ?????? kkkkkfDon’t fet order of operationspowers, then multiplication, finally addition amp。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。 subtraction Rememberthis tells you what is on the right hand sideit is not something you work. It says that the right hand side is the function f and it has x in it. ? ? 632 2 ??? xxxfFind f (2). This means to find the function f and instead of having an x in it, put a 2 in it. So let’s take the function above and make parenthesis everywhere the x was and in its place, put in a 2. ? ? ? ? ? ? 623222 2 ??????f? ? ? ? ? ? 20668623422 ?????????fDon’t fet order of operationspowers, then multiplication, finally addition amp。s find the domain of another one: ? ? 4?? xxhWe have to be c