The equation for a plane tangent to z = f(x, y) at a point (xo, Yo) is given by z = f(xo, Yo) + f_(wo, Yo)(x – æo) + fy(x0; Y0)(y – yo) If we wanted to find an equation for the plane tangent to f(x, y) = 9xy – 3y + 5a? at the point (3, – 3), we'd start by calculating these: f(ro, Yo) = | fz(xo, Yo) = fy(xo, Yo) =

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A: Given function is fx, y, z = xy2-x2z+yz2-z-11

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