8x? + 8y² + 3xª + 6x²y² + 3yª x² + y? 4 Consider the function f(x,y)= Select all that apply. Your answer: O fx(x,y) +f,(x,y) = 6(x + y) for (x,y)= (0,0). The domain of the function f(x,y) is the set R² - {(0,0)). O The surface of f(x,y) is described by the paroboloid z = 8+3(x2 +y²),z # 8. O The surface of f(x,y) intersects the xz-plane in the parabola z = 8+3x²,x÷0 The surface of f(x,y) is described by the paroboloid z = 8+3(x2 + y²).

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