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need_help!

Find \sqrt{(-4x+5)^2}

  • one year ago
  • one year ago

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  1. need_help!
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    \[\sqrt{(-4x+5)^2} \]

    • one year ago
  2. pigrenex
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    the answer is (-4x + 5)

    • one year ago
  3. need_help!
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    Actually I remember something with absolute value.. My question is: Is it like this |-4x+5| or |4x+5| ?

    • one year ago
  4. pigrenex
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    the square root and the exponent 2 are vanish

    • one year ago
  5. satellite73
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    i think you are right, it would be \(|-4x+5|\)

    • one year ago
  6. pigrenex
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    idk, because if you multiply both equations, the answer is the same. (-).(-) = (+)

    • one year ago
  7. pigrenex
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    you could write \[\pm(-4x + 5)\]

    • one year ago
  8. need_help!
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    Yes, maybe.. I went to wolfram to check, got something weird http://www.wolframalpha.com/input/?i=sqrt%7B%28-4x%2B5%29%5E2%7D+++ :P Haha, thank youuuu =)

    • one year ago
  9. pigrenex
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    but, satelite73 is not wrong. I think you can use both answers

    • one year ago
  10. need_help!
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    Actually YES! Satellite is absolutely right :) |4x+5| is wrong. Thank you pigrenex!

    • one year ago
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