+0  
 
+1
306
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Help!

 Dec 8, 2017
 #1
avatar+95859 
+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

 Dec 9, 2017

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