?In Exercises 9 - 20, find an equation of the tangent plane to the surface at the given point. \(x y^{2}+3 x-z^{2}=8, \quad(1,-3,2)\)

Step 1 of 5) Because the limit is r = 1, we cannot decide from the Ratio Test whether the series converges. When we notice that an+1>an = (2n + 2)>(2n + 1), we conclude that an+1 is always greater than an because (2n + 2)>(2n + 1) is always greater than 1. Therefore, all terms are greater than or equal to a1 = 2, and the nth term does not approach zero as nS q. The series diverges.