29.5k views
1 vote
Find an equation of the tangent plane to the given surface at the specified point. The surface is described by the equation z = 8x² y² - 7y. The specified point is (1, 3, -4).

1 Answer

3 votes

Final answer:

To find the equation of the tangent plane to the given surface at the specified point, we need to find the partial derivatives of the surface equation with respect to x and y. Then, we can substitute the values from the specified point into the partial derivatives to get the slope of the tangent plane. Finally, we can write the equation of the tangent plane using the point-slope form.

Step-by-step explanation:

To find an equation of the tangent plane to the given surface at the specified point, we need to find the partial derivatives of the surface equation with respect to x and y. Then, the tangent plane can be represented by the equation:



z - z0 = fx(x0, y0)(x - x0) + fy(x0, y0)(y - y0)



where fx(x0, y0) and fy(x0, y0) are the partial derivatives evaluated at the specified point (x0, y0).



In this case, the partial derivatives are:



fx(x, y) = 16xy2

fy(x, y) = 16x2y - 7



Substituting the values from the specified point (1, 3, -4):



fx(1, 3) = 16(1)(32) = 144

fy(1, 3) = 16(12)(3) - 7 = 41



Therefore, the equation of the tangent plane is:



z - (-4) = 144(x - 1) + 41(y - 3)

This can be simplified to:



z = 144x + 41y - 425

User Anurag H
by
8.2k points