Solve crash

[lrdheat]

Interestingly, when solving for 1st derivative of the above equation to be zero, nSpire, Classpad 400 CAS's have no problem finding exact solutions of -1 and 1/224 (takes both platforms quite some time). Non CAS Classpad and 9860gii, on the other hand, cannot handle the almost flat f(x)=~1 for ~-1.7<x<-~.17. 9860gii found an incorrect answer of ~-1.39 for the graph view that I had chosen. CLASSWIZ, instead of reporting incorrect answer, reports that it can't solve it.