Answer:
The answer is -6 but its not in the option
Step-by-step explanation:

Let x = -5
[(-5)²-1]/(-5+1)
= (25-1)/(-4)
= 24/-4
= -6
So you have to put 25 inside the blank box.
look at the attached picture
Hope it will help you
Good luck on your assignment
X,x because we dont know its value