Question . 1 Consider the surface x + + Using a graphing tool . to sketch this Surface . Then . answer the following a ) . Find the equation of the tangent plane to this surface at the point (312, 2 ) b ) Find a point at which the tangent plane. to this surface is horizont . Are there any other such points ? C) . Find a point at which the tangent plane to this surface is vertical . Are there any other such points ? Question. 2 Find the linear approximation of the function f ( x , 4 , z ) = 1 x 7 9 3 + 2 2 at an appropriate point ( -, -, - ) and use it to approximate the number V ( 3 . 02 ) 2 + ( 1 , 97 ) 2 + (5. 99)2 . ( use lineurization eyn for fix, y) = z & extend it to f (x, y, z ) = w