[ A ] 2x 

[ B ] 2  
[ C ] 1  
[ D ] 4 
[ A ] 2x 

[ B ] 2  
[ C ] 1  
[ D ] 4 
Answer : Option D 
Explanation : 
4$x^2$ + 8x = ($2x^2$) + 2 Ã— 2xÃ— 2 = $(2x+ 2)^2$â€“ 4 So, we have to add up 4 to make it a perfect square 
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