If x is an integer and 9<x^2<99, then what is the value of maximum possible value of x minus minimum possible value of x?
A. 5
B. 6
C. 7
D. 18
E. 20
For detailed Answers..
Also tricky. Notice that can take positive, as well as negative values to satisfy
, hence
can be: -9, -8, -7, -6, -4, 4, 5, 6, 7, 8, or 9. We asked to find the value of
, ans since
and
then
.
Answer: D.