Elitmus Exam Numerical Ability Log and Antilog

f(x)=Log base a (x)+Log base b (x) and 1

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Elitmus Other Question
What is the value of x is real number ?
(1) x^2 + 1 = 1/(x^2 + 1)
(2) x^3 + x^2 = 0
Mark A if question can be answered by using one of the statements alone, but cannot be answered by usingthe other statements alone
Mark B if question can be answered by using either statements alone
Mark C if question can be answered by using both statements together, but cannot be answered by using either statements alone
Mark D if question can not be answered even by using both statements together (n+a) and (n+b) are the two perfect square , n,a,b are whole numbers.
a=11, b=56 so what are the possible values of n...???

i) None ii) only 1 iii) 2 iv) 4