If the gradient of $f$ is $\nabla f = y\vec{j} - 3x\vec{i} - zy\vec{k}$ and the point $P = (-1, -3, 8)$ lies on the level surface $f(x, y, z) = 0$, find an equation for the tangent plane to the surface at the point $P$. $z = x - y + 8z - 66 = 0$
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Step 1: The gradient of $f$ at point $P$ is given by: $\nabla f(-1, -3, 8) = (-3)\vec{j} - 3(-1)\vec{i} - (8)(-3)\vec{k} = 3\vec{i} - 3\vec{j} + 24\vec{k}$ This vector is normal to the tangent plane at point $P$. Show more…
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