+0  
 
+1
207
1
avatar

 

 

 

 

Help!

Guest Dec 8, 2017
 #1
avatar+87293 
+1

 

The sum of the numerator  will be   (x) ( x - 1) / 2

 

So we have that

 

[ (x ) (x - 1) ] / 2

_____________          =    3

          x

 

(x) ( x - 1)

_________              =    3     multiply both sides by 2x

     2x

 

 

x^2 - x  =   6x           subtract   6x from both sides

 

x^2  -7x  =  0         factor

 

x ( x - 7)  =  0      set each factor to 0 and solve for x

 

And   x  = 0    [reject]    or x  =  7

 

 

Proof

 

6/7   + 5/7  +  4/7 + 3/7  + 2/7  +  1/7   =

 

 21 / 7     =    3

 

 

 

cool cool cool

CPhill  Dec 9, 2017

8 Online Users

New Privacy Policy

We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive information about your use of our website.
For more information: our cookie policy and privacy policy.