Question:

Finding the counterexample?

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I got a couple problems i need help with. So here it is.

"Show the conjecture is false by finding a counterexample."

The square root of a number x is always less than x.

&

If m is a nonzero integer, then m+2(over m) is always greater than 1.

so i have to prove these wrong. how do i do that?

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4 ANSWERS


  1. sqrt(.25) = .5

    .5 > .25

    /*****************************/

    let m = -1

    (m+2) / m = (-1 + 2)/(-1) = - 1/2 < 1


  2. Example: x=0.5 ➞ x²=0.25

    Generally, if 0<x<1, x²<x.

    Example: m=-1 ➞ (m+2)/m = -1 < 1

  3. sqrt 1=1

    so that disproves the fact that 1 has to be greater than the sqrt of 1. Same thing stands for 0.

    (m+2)/m =1 if m in INFINITELY LARGE

    Since adding 2 to a BIG number will do nothing.


  4. the trivial counterexamples are √ 1 and m = negative integer.{ if m = positive then statement is valid & if x > 1 the 1st is also true}

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