The answer would be 80 because you are multiplying each number by 2. You multiply 5 x 2 = 10, 10 x 2 = 20, 20 x 2 = 40, and then 40 x 2 = 80. That is how I got the answer 80!!
        
                    
             
        
        
        
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Answer:
30
Step-by-step explanation
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In order to find the Least common multiple we write each of the factor only once from each of the expression and for the common expression we take their LCM as maximum of the exponent in  all expressions 
as here in the question exponent of (x+1) are 3 and 8 so we take exponent 8 
likewise for (x-4) we shall take maximum of 2 and 5 which is 5 
so our expression for Least common multiple will be 
2X3X5 X 
30