Checking if a table represents a function (video) | Khan Academy (2024)

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  • Kiara

    10 years agoPosted 10 years ago. Direct link to Kiara's post “If there is the same outp...”

    If there is the same output for two different inputs, then is it still a function?

    (17 votes)

    • Just Keith

      10 years agoPosted 10 years ago. Direct link to Just Keith's post “Yes, that qualifies. As ...”

      Checking if a table represents a function (video) | Khan Academy (4)

      Yes, that qualifies. As long as each input yields only one output. It makes no difference whether the output is unique.

      (13 votes)

  • Chanda Jones

    5 years agoPosted 5 years ago. Direct link to Chanda Jones's post “so, I'm learning function...”

    so, I'm learning functions in my high school algebra 1 class, and i'm still a bit confused. Can you explain how to solve a function?

    (4 votes)

    • HYENA

      5 years agoPosted 5 years ago. Direct link to HYENA's post “To solve a function, you ...”

      To solve a function, you need to understand the mechanism. A function is like a microwave, you put something in it, and something will come out. So, an input and an output. For example f(x) = x + 1, given x is 7. You would insert 7 into the equation, f(7) = 7 + 1, which is 8. So the input is 7, resulting in an output of 8. Also, the f(x) part does not mean mulitplication, it is a format used for functions. Good luck!

      (7 votes)

  • lia

    8 years agoPosted 8 years ago. Direct link to lia's post “can a swiggly line be a f...”

    can a swiggly line be a function

    (5 votes)

    • Benjamin

      7 years agoPosted 7 years ago. Direct link to Benjamin's post “Yes, but only if it doesn...”

      Yes, but only if it doesn't have the same x-value twice

      (5 votes)

  • gavin carmichael

    9 years agoPosted 9 years ago. Direct link to gavin carmichael's post “i dont get this pleas hel...”

    i dont get this pleas help

    (2 votes)

    • aboomd

      9 years agoPosted 9 years ago. Direct link to aboomd's post “if x corresponds to 2 y v...”

      if x corresponds to 2 y values it is not a function . if x corresponds to 1 y value then it is a function

      (8 votes)

  • Hanalei Ezz

    9 years agoPosted 9 years ago. Direct link to Hanalei Ezz's post “Hi! I'm having a lot of t...”

    Hi! I'm having a lot of trouble with a specific question regarding functions, but I'm not sure where to post it.. the question is, if f(x) |-> ax^2 + bx + c, and {x: 3, 1, -2} and {y: 32, 6, -3} then what are the values of a, b and c? So far I have done this using the quadratic formula as well as by using simultaneous equations. Does anyone else have a better idea on how to do it?

    (3 votes)

    • Thomas B

      9 years agoPosted 9 years ago. Direct link to Thomas B's post “Write 3 equations by plug...”

      Write 3 equations by plugging in each x and y:
      9a + 3b + c = 32
      a + b + c = 6
      4a - 2b +c = -3

      At this point is is just a straight solve of 3 linear equations with 3 unknowns, so just use your preferred technique to solve for a, b, and c.

      (3 votes)

  • Vaanya

    4 years agoPosted 4 years ago. Direct link to Vaanya's post “What if we had a table an...”

    What if we had a table and a point repeated? For example, *(1,1)* and then, it is *(1,1)* again. Would that be a function or not?

    (3 votes)

    • masterchristianlove

      3 years agoPosted 3 years ago. Direct link to masterchristianlove's post “yes it would still be a f...”

      yes it would still be a function because if you input 1 and get only 1 then it is considered a function

      (3 votes)

  • Krzysztof Wrobel

    10 years agoPosted 10 years ago. Direct link to Krzysztof Wrobel's post “Is not a function continu...”

    Is not a function continuous ?
    Isnt't is a series ?

    (3 votes)

    • masterchristianlove

      3 years agoPosted 3 years ago. Direct link to masterchristianlove's post “I dont know how to awnsor...”

      I dont know how to awnsore this for you but what I can tell you is that it does not go on forever

      (3 votes)

  • kirsche23

    7 years agoPosted 7 years ago. Direct link to kirsche23's post “but what if you have like...”

    but what if you have like, 1,1 and 1,2. what do you do? i'm confused at

    Checking if a table represents a function (video) | Khan Academy (24) 0:15

    . what do you do?

    (3 votes)

    • masterchristianlove

      3 years agoPosted 3 years ago. Direct link to masterchristianlove's post “hello unknown person I w...”

      hello unknown person
      I will tell you that you cant do anything because the relation is not a function so if you have (1,1) and (1,2) it is then considered not a function
      hope this helps
      the master

      (3 votes)

  • JordanLenox

    6 years agoPosted 6 years ago. Direct link to JordanLenox's post “How do I work a table tha...”

    How do I work a table that has variables in place of the x-values?

    (3 votes)

  • holo

    9 months agoPosted 9 months ago. Direct link to holo's post “can different inputs have...”

    can different inputs have the same output??

    (1 vote)

    • 🅹🅾🅷🅽🅽🆈

      9 months agoPosted 9 months ago. Direct link to 🅹🅾🅷🅽🅽🆈's post “Sometimes yes. For exampl...”

      Sometimes yes. For example, consider y=0x. If x = 1, y = 0. If x = 2, y is still 0.

      (5 votes)

Checking if a table represents a function (video) | Khan Academy (2024)

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