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Homework Statement
Solve for t:
[-2(t2+1) / 9(t2-1)] < 0
The Attempt at a Solution
I know that the answer is -inf<t<-1 and 1<t<inf, but how do I show the calculation to get that answer? When I tried, I narrowed it down to t<root-1, but that's not possible (without complex numbers) and doesn't match the answer?