# The term, that should be added to (4$x^2$ + 8x) so that resulting expression be a perfect square, is

 [ 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