Equation of tangent plane : f(x,y) = x^2 + y^2 , (x0,y0,z0) = (1,2,5)

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Find an equation for the tangent plane to the graph of 𝑓(𝑥,𝑦)=𝑥^2+𝑦^2
at the point (1,2,5)

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