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Math Help - Algebra Review

  1. #1
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    Algebra Review

    I cant make this problem work for whatever the reason is.
    (2z)^(1/2)-(z+7)^(1/2)=1
    For whatever reason i want to square all of it but then one i solve it down i get -6 and i know thats not right.
    thanks to anyone
    AC
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  2. #2
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    Quote Originally Posted by Casas4 View Post
    I cant make this problem work for whatever the reason is.
    (2z)^(1/2)-(z+7)^(1/2)=1
    For whatever reason i want to square all of it but then one i solve it down i get -6 and i know thats not right.
    thanks to anyone
    AC
    Get one term on the other side...
    <br />
\sqrt{2z}=1+\sqrt{z+7}<br />
    Then square. See if you can take it from there.
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  3. #3
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    graphing problem

    what is wrong with the graph to this equation?

    +- the square root of 1-x^2
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  4. #4
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    what do i do from here

    Ok so when i square root both sides do i square root (1+(z+7)^1/2 or just (z+7)^1/2
    When i tried doing it (1 +((z+7)^1/2))^2 i still couldnt get it to work.
    Sorry for whatever reason i cant make this problem work.
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  5. #5
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    Quote Originally Posted by Casas4 View Post
    Ok so when i square root both sides do i square root (1+(z+7)^1/2 or just (z+7)^1/2
    When i tried doing it (1 +((z+7)^1/2))^2 i still couldnt get it to work.
    Sorry for whatever reason i cant make this problem work.
    You're never going to square root anything in this problem. You're squaring both sides. For (1 +((z+7)^1/2))^2,
    which is the same thing as (1+\sqrt {z+7})^2, you have to use FOIL by splitting the square into 2 binomials. (1+\sqrt {z+7})(1+\sqrt {z+7}) FOIL is the order of what terms to multiply when multiplying 2 binomials.

    First - Multiply the first terms ( 1 and 1)
    Outer - Multiply the outer terms ( 1 and \sqrt {z+7})
    Inner - Multiply the inner terms ( \sqrt {z+7} and 1)
    Last - Multiply the last terms ( \sqrt {z+7} and \sqrt {z+7})
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  6. #6
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    Quote Originally Posted by Weezy View Post
    what is wrong with the graph to this equation?

    +- the square root of 1-x^2
    Do not post new questions in existing threads. Start a new thread.
    Do not ask for help in Live Chat. Live Chat (as it clearly states) is for small talk. (Against my better judgement I have edited an answer into your chat).
    Your question here makes no sense - it requires more information.
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