Find the second-order Taylor formula for ƒ(x, y) = (4x + 3y)² at x₁ = (0,0). Note that R₂ (0, h) = 0 in this case. (Use symbolic notation and fractions where needed. Give your answer in the form of f (h₁, h₂) = f(l, m) where 1 = h₁ and m = h₂.) f(l,m) =

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