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f (x) ( / ˌɛf ˈɛks /; Korean : 에프엑스; RR : Epeuekseu) is a South Korean girl group, consisting of Victoria, Amber, Luna, Krystal, and previously Sulli until her departure from the group in August 2015. Formed by SM, f (x) officially debuted in September 2009 with the release of the digital single "La Cha Ta".
f (x) (에프엑스) was a South Korean girl group that in the last part of their career consisted of 4 members: Victoria, Amber, Luna, and Krystal. f (x) debuted on September 5th, 2009 under SM Entertainment. In August 2015, Sulli officially left the group to concentrate on her acting.
A function relates an input to an output. It is like a machine that has an input and an output. And the output is related somehow to the input. Input, Relationship, Output. We will see many ways to think about functions, but there are always three main parts: The input. The relationship. The output.
The f is just a way for you to know that when you see f(x) to treat it as a function and not mistakenly treat it as multiplying one variable by the other (it DOES NOT mean f multiplied by x). It does not have to be an f, it can be any symbol and using different symbols such as h(a) helps differentiate one function from another.
- 8 min
- Sal Khan
- Ωπ fαz919 πΩ , By definition of a function, a circle cannot be a solution to a function. A function, by definition, can only have one output value...
- You have to remember that in algebra, what is done to one side of the equation has to also be done to the other side of the equation. When y^2 = 3,...
- They are very similar. I think the best way to put it is that a math function takes in some mathematical construct (be it a number or some other va...
- _The next largest number that starts with the same letter as_ 2 is 3. They both start with the letter t. In the same way, _The next largest number...
- Yes, a function can have multiple inputs. We can graph in the coordinate plane when we have 1 input to 1 output. If we have a function with 2 input...
- Yep, there definitely is. Let's consider a circle with center (0, 0) (to make the explanation a little simpler) and radius 3. Let's find some point...
- Basically, the concept of functions gives us a way to name the whole process of evaluating a particular expression, so we can talk about it as a wh...
- Good question, but, we need more info! For essence 'h (a) = x*a + b', where 'x' is the slope of the function and 'b' is the Y-axis intersection, or...
Through a worked example involving f(x)=√(x²-1) and g(x)=x/(1+x), learn about function composition: the process of combining two functions to create a new function. This involves replacing the input of one function with the output of another function.
- 3 min
- Sal Khan
- There is an addition sign separating the two terms, so cancelling them would not be possible
- keep going! I feel the same way sometimes, a snack usually helps
- Hi Mirghani, You can simplify the expression, but it will still be a hairy expression. Let's see how it turns out- f(g(x)) = sqrt (x/x+1)^2 - 1 = s...
- I would agree with you...a simplified answer would have no radical in the denominator. Though, when I did it I got: (x^2 +1-sqrt(x^2-1))/x^2. Sal d...
- Almost. In the video, it's sqrt((x^2/(1+x)^2) - 1), not sqrt((x^2/(1+x)^2) + 1). Therein lies your mistake; sqrt(-1) is an impossible number. Howev...
- With practice, you will most likely be able to find composite functions mentally. This may not happen for all problems, but for some, it certainly...
- You could if you were looking at a particular value of x. In this example, Sal was simply using the two functions to build a single function. This...
- If you are asking can you change f(x)/[1+f(x)] into f(x)/1 + f(x), the answer is no. Why? 1) The denominator has terms. We can't split the fraction...
- Generally, it doesn't matter, but some teachers are pretty irritated with roots in the denominator. Personally, in an exam, I'd rationalize it to b...
f(x) just means "a function in terms of x" and it is the same as y, except f(x) is a function and must have only 1 y-value for each assigned x-values (in other words it must pass the "line test").
- 6 min
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