Find a function f : R² → R, where f its tangent plane at the point (1; 1; f(1; 1)) is given by 6x-12y+4 and whose equation of -2.x -9y+z+8 = 0. %3D

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Q: Find a function f:R² → R, its tangent plane at the point (1; 1; f(1; 1)) is given by -2x – 9y – z+8…

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