find the area of the region described below.
f(x)= -e^((1/2)x)
Find the area of the region bounded below by the graph of f(x) and above by the x-axis from x = -4 to x = 4.
integral of -e(1/2 x) dx = -2e^(1/2 x)
now just plug in x= 4 and -4 and subtract