You can predict that it's odd because the end of the 2 numbers is 1 and 1 x 1 is 1 and one is an odd number. (answer is odd)
        
                    
             
        
        
        
2, left direction (or negative if that’s an option)
        
                    
             
        
        
        
 <span>[ (1 / 36) - (1 / x²) ] / [ (1 / 6) + (1 / x) ] 
[ (x² - 36) / 36x² ] / [ (x + 6) / 6x ] 
</span>remember that<span>: 
x² - 36 = (x + 6)(x - 6) 
so
[ (x+6)(x-6) / 36x² ] / [ (x + 6) / 6x ] 
[ (x+6)(x-6) / 36x² ] * [ 6x / (x + 6) ] 
6x / 36x² = 1 / 6x 
[ (x+6)(x-6) / 6x ] * [ 1 / (x+6) ] -------------------- > </span>(x - 6) / 6x<span>
The answer is </span>(x - 6) / 6x<span>
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