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Math Help - Urgent Help

  1. #1
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    Exclamation Urgent Help

    Hey guys can you please help me with these two problems? I just do not understand how to do them, I don't know where to begin!



    Find each value if g(x) = 2x + 3 and h(x) = x/2-7


    Find: G(9)

    Find: H(4)
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  2. #2
    Site Founder Math Help's Avatar
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    Substitution

    This type of problem is an exercise in substituting a value (such as 9) for a variable (such as x).

    1. Find: G(9) if G(x) = 2x + 3

    we replace x with 9 in the above equation so:

    G(9) = 2*9+3 .........|replace x with 9
    G(9) = 18+3 ...........|multiplacation before addition (PEMDAS)
    G(9) = 21

    Try to do the second one here as a reply and I will correct you.
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  3. #3
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    So for problem: H(4)


    H(4)= 4/2-7

    4/-5

    = -0.8

    Please correct me if I am wrong.
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  4. #4
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    h(x) = x/2-7
    Find: H(4)

    Don't forget the order of operations. First you devide then you subtract. So you have:

     H(4) = \frac{4}{2} -7

     H(4) = 2 -7

     H(4) = -5
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  5. #5
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    Thank you for your help. I appreciate it very much
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  6. #6
    Site Founder MathGuru's Avatar
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    Order of Operations

    Regarding order of operations:

    Remember PEMDAS

    Parentheses
    Exponents
    Multiplication
    Division
    Addition
    Subtraction

    So if there are no parentheses as in the above problems, you first do exponents then multiplication then division etc.
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