Find three irrational numbers between : (i) -1 and -2          (ii)1/5 and 1/4        

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embizze's profile pic

embizze | High School Teacher | (Level 1) Educator Emeritus

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Irrational numbers are numbers that cannot be expressed as rational numbers, i.e. fractions with numerator and denominator both whole numbers.

(1) Irrationals between -1 and -2:

`-sqrt(2),-sqrt(3),-pi/2` are all irrational.

(2) Between `1/5` and `1/4` :

`sqrt(1/23),sqrt(1/19),sqrt(1/17)` are all irrational.

** If you write them using the rules of simplifying radicals you will get `(sqrt(23))/23,(sqrt(19))/19,(sqrt(17))/17` where each numerator is irrational.**

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sam-iam-qqq's profile pic

sam-iam-qqq | College Teacher | eNotes Newbie

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3 irrats between -1 and -2 is asking the same as 3 irrats between 0 and 1.. the 1st that comes to mind is 2-sqrt(2).. the next two are 4-pi and 3-e.. to translate those three numbers to (-2,-1), we employ a linear combination of rationals to 'force' 2-sqrt(2), 4-pi, and 3-e into that region.. the simplest solution is: -1-2+sqrt(2), -1-4+pi, and -1-3+e. this equates with: -3+sqrt(2), -5+pi, and -4+e .. to push 'the solution' to the interval: (1/5,1/4), we need to construct a linear combination of rationals and irrationals as we did for (-2,-1). the length of the segment is critical as is the 'starting point'. so we must perform a linear transformation (rational based) on the solution set to conform to (1/5,1/4). 0.05 is the length of the interval. 0.2 is the starting point. so, 0.2+0.05i where i represents an irrational number. this is a 'new' result of my conjecture and soon-to-be theorems.

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