Question:

Can someone help me with this square root equation?

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(√3 + 1) ÷ (√2 +1)

(It reads: The square root of three plus one divided by the square root of two plus one.)

Thanks.

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8 ANSWERS


  1. By Rationalizing you get

    √6 + √2 - √3 - 1


  2. Whenever you have something like a + √b in the denominator, you can always make it rational by multiplying by the conjugate, a - √b.  So multiply the top and bottom here by √2 - 1.

    [(√3 + 1) / (√2 + 1)] * (√2 - 1)/(√2 - 1) =

    [√6 + √2 + √3 + 1 ] / (2 - 1)

    √6 + √2 + √3 + 1


  3. Multiply top and bottom by √2 - 1 to make the denominator rational.

    (√3 + 1)(√2 - 1)/((√2 + 1)(√2 - 1))

    = (√6 +√2 - √3 + 1) / (4 - 1)

    = 1/3(√6 +√2 - √3 + 1)

    I'm not sure that this is any better than the original :-)

    --- EDITED to add ---

    I've seen quite a few answers below this that seem to be quite emphatic about rationalizing the denominator, but having done so they throw it away!  The denominator value becomes 3, so you need a 1/3 factor in your final answer.

  4. (√3 + 1) / (√2 +1)

    rationalising

    (√3 + 1) (- √2 +1) / (√2 +1)(- √2 +1)

    (-√6 - √2 + √3 + 1) / (1 - 2)

    (√6 + √2 - √3 - 1)

    (√6 - √3 + √2  - 1)

    √3(√2 - 1) + 1 (√2 - 1)

    (√3 +1) (√2 - 1)

  5. I'm guessing you want me to "rationalize" this expression.

    1) Multiply top and bottom of the fraction by the denominators conjugate, (1 - √2).

    2) After doing step 1, you should be left with -(1 + √3)(1 - √2)

  6. (√3 + 1)(√2 - 1)/(√2 +1)(√2 -1)

    (√6-√3+√2 -1)/(2-1)

    (√6-√3+√2 -1)

    √3(√2 - 1) + 1 (√2 - 1)

    (√3 +1) (√2 - 1)

  7. (√3 + 1)  = 2.732, rounded

    (√2 +1)  = 2.414, rounded

    (√3 + 1) ÷ (√2 +1) = 1.132, rounded


  8. √3 + 1.....√2 - 1

    ---------- * -----------

    √2 + 1.....√2 - 1

    = √6 + √2 - √3 - 1

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