thanks 8. Find the planes tangent to the following surfaces at the indicated points: (a) x +

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8. Find the planes tangent to the following surfaces at the indicated points: (a) x² + 2y² + 3xz = 10, at the point (1, 2, 3) Open (b) y² - x² = 3, at the point (1, 2, 8) (c) xyz = 1, at the point (1, 1, 1) 8. Find the planes tangent to the following surfaces at the indicated points: (a) x² + 2y² + 3xz = 10, at the point (1, 2, 3) Open (b) y² - x² = 3, at the point (1, 2, 8) (c) xyz = 1, at the point (1, 1, 1)