函数概念

函数概念内容摘要：

d). 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. 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      8668623422 fDon’t fet order of operationspowers, then multiplication, finally addition amp。 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。 subtrac。