Quantcast

Got Homework?

Connect with other students for help. It's a free community.

  • across
    MIT Grad Student
    Online now
  • laura*
    Helped 1,000 students
    Online now
  • Hero
    College Math Guru
    Online now

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

abayomi Group Title

what is a function?

  • 2 years ago
  • 2 years ago

  • This Question is Closed
  1. moneybird Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    function is like an input-output machine

    • 2 years ago
  2. GT Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    From Wikipedia: In mathematics, a function associates one quantity, the argument of the function, also known as the input, with another quantity, the value of the function, also known as the output. A function assigns exactly one output to each input.

    • 2 years ago
  3. karatechopper Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    ur x's cant repeat

    • 2 years ago
  4. mathteacher1729 Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    In math, a function has two basic steps: 1) you start with some number, called an "input". 2) the function "DOES STUFF" to the input (squares the number, then adds one, or takes the square root of the input and divides by two, etc.) 3) after you're done, you have the output. So if the function is f(x) = 3x + 1 a sample "input" would be x = 4 The function "DOES STUFF" to x = 4, specifically, this function takes x , multiplies it by three, and then adds one. So the OUTPUT is 3*4 +1 = 12 + 1 = 13. :) Hope that helps.

    • 2 years ago
  5. abayomi Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    a function is anything applied to an entity to change its state? i.e a "function" is a modifier?: just so im clear

    • 2 years ago
  6. mathteacher1729 Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    A function DOES something to the input.

    • 2 years ago
  7. abayomi Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    thanks @mathteacher1729 that was clear

    • 2 years ago
  8. GT Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    I don't think it is change the state of anything. It is simply allowing you to "compute" an output value given an input value. Like a transformation of input value to an output value.

    • 2 years ago
  9. abayomi Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    sounds like a codebreaker key ring

    • 2 years ago
  10. abayomi Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    to be graphic i could say the enigma machine is a function?

    • 2 years ago
  11. GT Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Hmmmmm.....looks like we have a newbie spammer here.

    • 2 years ago
  12. abayomi Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    lol

    • 2 years ago
  13. abayomi Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    i"ll ignore the insult

    • 2 years ago
  14. dmihail Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Do you know what a relation is ? mathematically speaking ...

    • 2 years ago
  15. abayomi Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    i have a rather foggy idea.

    • 2 years ago
  16. dmihail Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Well, you can think of relations between people. It's the same thing, only it's more abstract. So a function is a relations. Let's say you have 2 sets of people. Then, you define a relation, like "friendship", and you say that x from the first set is in relation with y from the second set ( x,y are people ) if and only if x is friend with y. You can also say the same thing with the following notation : xRy. For that relation to be a function, x has to be friend with only y. So every person from the first set must have only one person in the second set with which he is in relation. So that's another way of defining functions : a relation for which every x from the domain ( or input ) must have one and only one y in the codomain ( output ) such that xRy. And since this is a function, you can note f(x) = y. Hope this didn't confuse you more :)

    • 2 years ago
  17. mathteacher1729 Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    Function vs. Relation Function ==> Each input goes to exactly and only one output. Just as one person cannot be in two places at once, one input cannot go to more than one output. Relation ==> Each input can go to as many outputs as the function pleases. It's the equivalent of one person being in more than one place at once.

    • 2 years ago
    • Attachments:

See more questions >>>

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.