Answer:
x = 4
Explanation:
Value of
will be imaginary. if
=

Since
is not defined to square root will be imaginary.
In this question greatest possible integer value of x has been asked.
(x-5) will be negative if x<5 and the maximum value of x will be 4 above which (x-5) will be greater than zero.
Therefore, x = 4 is the maximum integer value of x for which square root of (x-5) is an imaginary number.