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2025-01-12 06:39本頁面
【正文】 ad each student getting the sa e grade. That’s okay. Set A is the domain 1 2 3 4 5 Set B is the range 2 10 8 6 4 Must use all the x’s The x value can only be assigned to one y This is not a functionit doesn’t assign each x with a y Check this relation out to determine if it is a function. It is not3 didn’t get assigned to anything Comparing to our example, a student in Math 1010 must receive a grade Set A is the domain 1 2 3 4 5 Set B is the range 2 10 8 6 4 Must use all the x’s The x value can only be assigned to one y This is a function Check this relation out to determine if it is a function. This is fine—each student gets only one grade. More than one can get an A and I don’t have to give any D’s (so all y’s don’t need to be used). We monly call functions by letters. Because function starts with f, it is a monly used letter to refer to functions. ? ? 632 2 ??? xxxfThe left hand side of this equation is the function notation. It tells us two things. We called the function f and the variable in the function is x. This means the right hand side is a function called f This means the right hand side has the variable x in it The left side DOES NOT MEAN f times x like parenthesis usually do, it simply tells us what is on the right hand side. ? ? 632 2 ??? xxxfSo we have a function called f that has the variable x in it. Using function notation we could then ask the following: Find f (2). This means to find the function f and instead of having an x in it, put a 2 in it
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