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Math Help - Order of Operations Problem(s)

  1. #1
    Junior Member Melancholy's Avatar
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    Order of Operations Problem(s)

    5y^2 + y + 1; y=4

    So...

    5(4)^2 + 4 + 1

    I'm not sure if I am supposed to multiply the 5(4) before I square root it.

    5(4)^2 + 4 + 1
    = 20^2 + 4 + 1
    = 400 + 4 + 1
    = 405

    Did I work the problem correctly?

    Parentheses-Exponents-Multiplication-Division-Addition-Subtraction
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  2. #2
    Rhymes with Orange Chris L T521's Avatar
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    Quote Originally Posted by Melancholy View Post
    5y^2 + y + 1; y=4

    So...

    5(4)^2 + 4 + 1

    I'm not sure if I am supposed to multiply the 5(4) before I square root it.

    5(4)^2 + 4 + 1
    = 20^2 + 4 + 1
    = 400 + 4 + 1
    = 405

    Did I work the problem correctly?

    Parentheses-Exponents-Multiplication-Division-Addition-Subtraction
    Exponents have a higher precedence than multiplication.

    You would need to square 4 first, and then multiply by 5:

    5(4)^2+4+1=5(16)+4+1=\dots

    --Chris
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  3. #3
    Junior Member Melancholy's Avatar
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    Ahhh, thank you very much, Chris. I kept thinking that the parentheses around the four came first since they are, afterall, first on the "pemdas" list. Guess I need to do some serious review on my stuff before Algebra II this year, eh? ^_^

    <3
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