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Math Destroyer Test #3 Question 16


Full Member
2+ Year Member
May 11, 2017
    Hi all,

    I am kinda confused with how you get negative square root of 7 over 7 when you rationalize the denominator. To me it seems you should get a positive square root of 7 over 7. Thanks for the help!


    UCLA D4 🎉
    Volunteer Staff
    2+ Year Member
    Verified Expert
    Dec 25, 2016
    1. Dental Student
      Csctheta = -sqrt7
      Csc = 1/sin
      So flip it, it will become 1/-sqrt7
      Rationalize--> sqrt 7/-7, which is the same as - sqrt7/7 (just moved the negative to the top)
      The negative sign is outside, so you leave it alone. When you rationalize, only the numbers inside the sqrt sign matter. Hope this helps!
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