X^2+8x solve by completing the square

x^2 +8x

to complete the square add (b/2) ^2 where b is the coefficient of x

b=8 so (8/2)^2  = 4^2  =16

(x^2 +8x+16)

(x+4)^2

dalila is incorrect. the whisker on the left is very long, going all the way out to 5. the whisker goes from 5 to 30, so it has a spread of 25. the rest of the box plot values are closer together, so 5 is an outlier