Next we will consider the "negative" equation of the type (2.1):
are considered by R. Keskin, N. Demiturk [10].
Unlike the result in Theorem 2.1, there are only two values of a for which
the corresponding property holds.
Theorem 2.2. The solutions to the negative equation (2.10) are linear
combinations with rational coecients of at most two Fibonacci and Lucas
numbers if and only if a =