Which of the following inequalities is true for all valie of x

Question

A) 1/x^2 >0

B) 1/x^3 >0

C) 1/x^2+1>0

D)1/x^3+1>0

Answer 1

A invalid when x = 0.

B is invalid when x ≤ 0.

D fails when x ≤ -1

C is true for all x.