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anonymous

  • one year ago

Just a quick clarification? (Problem in comments.)

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  1. anonymous
    • one year ago
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    I need to find the conjugate of \[a-\sqrt{a-1}\]

  2. misssunshinexxoxo
    • one year ago
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    Plugged it in http://www.wolframalpha.com/input/?i=a%E2%88%92a%E2%88%921%E2%88%92%E2%88%92%E2%88%92%E2%88%92%E2%88%9A

  3. anonymous
    • one year ago
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    I'm not sure if it is \[a+\sqrt{a+1}\] or \[a-\sqrt{a-1}\] the lesson I had is not very clear.

  4. anonymous
    • one year ago
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    I just need to know if when flipping the sign I flip the sign on the inside of the radical?

  5. mathstudent55
    • one year ago
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    Only the - between the a and the root changes to +.

  6. anonymous
    • one year ago
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    Ok thanks @mathstudent55

  7. mathstudent55
    • one year ago
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    You're welcome. \((a - \sqrt{a - 1})(a + \sqrt{a - 1})\) follows the pattern \((a - b)(a + b) = a^2 + b^2\) The root term will disappear after multiplication. If you change the sign inside the root, it no longer follows the pattern of the product of a sum and a difference and the root terms will still be there after multiplication.

  8. anonymous
    • one year ago
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    Got it

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