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Discrete Mathematics Functions

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  • #51368

    jugnu
    Participant

    Q:1 If f(x)=x/2+3 and g(x)=3/4x-2then find the value of5f(-2)-7g(-4)Q:2 For the real valued function, f defined below Find f^-1(-1) Wheref(x)=3x^2+7Q:3 The sum of three numbers in A.P is 24 and their product is 440.Find the numbers.

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    #177922

    RC
    Participant

    Q1) -350
    Q2) .10
    Q3) ?
     

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    #177923

    jugnu
    Participant

    How did u solve this?

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    #177926

    RC
    Participant

    Are there 2 RC’s?

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    #177935

    BritW
    Participant

    Q1=25

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    #177957

    RC2
    Participant

    Sorry
    Q1) 45
    Q2) .1
    Q3)  Don’t know what A.P. means.  However as the problem is written you have 3 unknows and two equations. 
    1. x+y+z=24
    2. (x)(y)(z)=440
    This type of problem can’t be solved.  You need a third equation.  Unless of course A.P. has some sort of meaning that helps with solving it. 
    To solve I just substituted -1,-2, and -4 for the x and solved the equations you gave.  Hope this helps.

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    #177959

    DLW
    Participant

    Actually, #3 is solved very easily with intuition.
    My question, though: What is the purpose of this? Exam? Homework?

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    #177960

    RC2
    Participant

    DLW you are right.  I guess I didn’t give it the proper amount of thought.  The answer is 8, 5, and 11.  I should have paid closer attention to my factoring efforts earlier. 
    Don’t know what it’s for I just like math problems.

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    #177961

    DLW
    Participant

    RC2,
    The “What is the purpose…” question was directed to the OP. While
    most of us here probably like math and logic problems (a very good
    thing, I think), every once in awhile someone tries to get others to do
    homework or even exam problems for them. So solve the problems, if
    you must :O) Just don’t give the answers to anyone who does not
    deserve them.
    DLW – BPEX

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    #177962

    jugnu
    Participant

    I m Sorry my mistake. A.P stands for Arithmetic Progression

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    #177963

    jugnu
    Participant

    The purpose is to solve assignment.Actually I m not getting the concept. Neither from lectures nor from books. That’s why i asked u peopleIf u can help me then pls do so. I need to know what are the steps to take solving these problems.Thanks & Regards

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    #177964

    Shakeel
    Member

    Please solved the problem and give a solution as soon as possible.
    The sum of three numbers in A.P is 24 and their product is 440.Find the numbers.

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    #177967

    bbusa
    Participant

    The numbers are 5, 8 , 11 . Is it correct ?

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    #177969

    Gourishankar
    Participant

    Jugnu
    Here’s my solution :
    Assume the 3 nos. are :  a , a+n , a+2n
    Eq 1 : a + (a+n) + (a +2n) = 24 => a+n = 8
    Eq. 2 : a*(a+n)*(a+2n) = 440
    Since a+ n = 8 , the eq. 2 becomes : a*(a+2n) =440/8 = 55
    The only possible values are :   a = 5 & a+2n = 11 , Solve this simple equation and you will get the three no.s in AP as 5 , 8 , 11
    Gourishankar
     

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    #177970

    jugnu
    Participant

    Thank you very much. You have saved my life

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