Svetlana Z. answered 03/14/17
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Female Engineer, UC Berkeley PhD, 30+years industry 1700+ hours tutor
I assume you want the area bounded by that curve, the x axis, and the lines x=-1 and x=1. Then the area is:
(integral from -1 to +1) (-e-xdx) = -e-x evaluated at -1 and +1
this is equal to -(e-1 - e) = e - 1/e