Answer:
Required equation of tangent plane is
.
Step-by-step explanation:
Given surface function is,
To find tangent plane at the point (5,-1,1).
We know equation of tangent plane at the point $(x_0,y_0,z_0)[/tex] is,

So that,



Substitute all these values in (1) we get,


Which is the required euation of tangent plane.
Wait what?? If you are talking about how much it could have caught it's 0 I guess
Yes, substitute a=2.
14 - 4 + 6 - 6 = -2
8 - 10 = -2