What are the solutions of the equation (x - 3)2 + 2(x – 3) - 8 = 0? Use u substitution to solve.
x= -5 and x = 1
x= -1 and x = 5
x= -1 and x = -7
x = 1 and x = 7

Use stokes' theorem to evaluate c f · dr where c is oriented counterclockwise as viewed from above. f(x, y, z) = xyi + 5zj + 7yk, c is the curve of intersection of the plane x + z = 8 and the cylinder x2 + y2 = 81.