1. lim f(x) = f(c) for all x=c therefore (triangle dots) f(x) is cont. x→c (only if polynomial; 1/x is not cont.)
2. Plug interval into polynomial (Answers must be have a range large enough to include number you are trying to hit)
3. “Therefore (triangle dots) by IVT f(x) has a solution to f(x)=1 on the \[-2,-1\]”