2017 AMC 8 Problems/Problem 21
Revision as of 13:34, 22 November 2017 by Nukelauncher (talk | contribs)
Problem 21
Suppose ,
, and
are nonzero real numbers, and
. What are the possible value(s) for
?
Solution
There are cases to consider:
Case :
of
,
, and
are positive and the other is negative. WLOG assume that
and
are positive and
is negative. In this case, we have that
Case :
of
,
, and
are negative and the other is positive. WLOG assume that
and
are negative and
is positive. In this case, we have that
In both cases, we get that the given expression equals .
~nukelauncher