1.

Which one is the complete set of values of x satisfying log x2 (x + 1) > 0?(a) (1, ∞)(b) (-1, 0) – {0}(c) (-1, 1) – {0}(d) (1, 0) ∪ (1, ∞)The question was asked during an interview.My question is from Applications of Quadratic Equations in section Complex Numbers and Quadratic Equations of Mathematics – Class 11

Answer»

The correct answer is (d) (1, 0) ∪ (1, ∞)

The EXPLANATION: If, X^2 > 1, then x + 1 > 0

So, x > 0

 x € (1, ∞)

 If, 0 < x < 1, the 0 < x + 1 < 1

 x € (-1, 0)

THUS, x € (1, ∞) ∪ (1, ∞)



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