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    ginwages's Avatar
    ginwages Posts: 2, Reputation: 1
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    #1

    Oct 5, 2007, 04:55 PM
    finding indicated values for the function
    the function of x f(x)=4x-7
    a) f(3)
    b) f(-5)

    the teacher told my son a) was the right answer. Why? If I can understand how to solve, I can help him.

    thanks,

    ginger wages
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #2

    Oct 5, 2007, 05:03 PM
    It's easier than you think. Just plug in the values.

    f(3)=4(3)-7=12

    That's all you do. Plug them in and see what you get.
    ginwages's Avatar
    ginwages Posts: 2, Reputation: 1
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    #3

    Oct 5, 2007, 05:07 PM
    Quote Originally Posted by ginwages
    the function of x f(x)=4x-7
    a) f(3)
    b) f(-5)

    the teacher told my son a) was the right answer. why? if i can understand how to solve, i can help him.

    thanks,

    ginger wages
    thanks. Then why not -5? Because in my brain
    f(-5)=4(-5)-7=-27

    I don't understand why this is a wrong answer and 3 is a right answer
    HELLLPPP!!
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #4

    Oct 5, 2007, 05:24 PM
    -20-7=-27. That's correct. How would anyone get 3 from that?

    If it were f(5/2), then 3 would be the answer.
    cool_dude's Avatar
    cool_dude Posts: 124, Reputation: 9
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    #5

    Oct 7, 2007, 08:31 AM
    Quote Originally Posted by ginwages
    the function of x f(x)=4x-7
    a) f(3)
    b) f(-5)

    the teacher told my son a) was the right answer.
    LOL I see where your confusion is. You said a) was the right answer. But what you don't understand is that a) is the question!!

    the question asks that you have an equation f(x) = 4x - 7 and it wants you to find the value when x = 3 which is part a) and when x = - 5 which is -27.

    so the answers are as follows
    a) f(3) = 4x-7 = 4(3) - 7 = 5
    b) f(-5) = 4x - 7 = 4(-5) - 7 = -27


    P.S. Galactus the answer to f(3) = 5 NOT 12
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #6

    Oct 7, 2007, 09:28 AM
    Yes, I see. A typo/brain fart.
    FlowerRing123's Avatar
    FlowerRing123 Posts: 1, Reputation: 1
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    #7

    May 11, 2009, 06:16 PM
    Quote Originally Posted by cool_dude View Post
    LOL i see where your confusion is. you said a) was the right answer. but what you don't understand is that a) is the question!!!

    the question asks that you have an equation f(x) = 4x - 7 and it wants you to find the value when x = 3 which is part a) and when x = - 5 which is -27.

    so the answers are as follows
    a) f(3) = 4x-7 = 4(3) - 7 = 5
    b) f(-5) = 4x - 7 = 4(-5) - 7 = -27


    P.S. Galactus the answer to f(3) = 5 NOT 12

    Wow, your smart! U helped me a lot! :eek:
    I'm a student! I needed help on my homework, then I came across this! THANKS A lot! :D
    bdown1's Avatar
    bdown1 Posts: 1, Reputation: 1
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    #8

    Feb 20, 2010, 07:43 AM

    Find the indicated value for the following function: f(x) = 3x + 6
    Find where F(x) = 0
    morgaine300's Avatar
    morgaine300 Posts: 6,561, Reputation: 276
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    #9

    Feb 21, 2010, 01:46 AM

    It would help terrifically a lot if you post your question in a new thread. I just spent time reading through all the above stuff just to find a completely different question. The more time we waste doing that, the longer it takes us to help people.

    If f(x) = 0, then 0 = 3x + 6. Then solve.
    wiccandream's Avatar
    wiccandream Posts: 4, Reputation: 1
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    #10

    Jun 23, 2010, 12:46 PM
    Comment on cool_dude's post
    I have been going absolutely insane trying to figure out functions and graphing and YOU have taught me how to do functions and I just want to say THANK YOU! My own instructor could not do this. Do you tutor? ($)
    deonnief's Avatar
    deonnief Posts: 1, Reputation: 1
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    #11

    Oct 27, 2010, 10:37 AM
    Find the indicated value?
    Find f(10) when f(x)=7x-3
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #12

    Oct 27, 2010, 10:56 AM

    Did you take a look at the previous answers? :rolleyes:

    There is the method of how to solve your problem in there.
    kanan_blg's Avatar
    kanan_blg Posts: 1, Reputation: 1
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    #13

    Nov 10, 2010, 06:17 PM
    f(10) = 7*10 - 3 = 70 - 3 = 67
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