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Find the linear approximation of the function f ( x , y , z ) = x 2 + y 2 + z 2 at

Find the linear approximation of the functionf(x,y,z) =x2+y2+z2at (6,2,9) and use it to approximate the number 6.012+1.972+8.982. (Round your answer to five decimal places.)

f(6.01, 1.97, 8.98)

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