Algebra help!!

How does rationalizing the denominator use the form of 1?

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asked by grace
  1. you can always multiply by 1 without changing the value. So, you want something that makes the denominator rational.

    (3+√7)/(2-√7) * (2+√7)/(2+√7)
    = (3+√7)(2+√7) / (2-√7)(2+√7)
    = (13+5√7)/-3

    (2-3i)/(6+i) * (6-i)/(6-i)
    = (2-3i)(6-i) / (6+i)(6-i)
    = (15-20i)/37

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    posted by Steve

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