Question: 3, Let f(x, y) = x2 + 2xy + y2. (a) Find the values of f(-1, 2), f(a, a), and f(a + h, b) -

3, Let f(x, y) = x2 + 2xy + y2. (a) Find the values of f(-1, 2), f(a, a), and f(a + h, b) - f(a, b) (b) Show that f(2x, 2y) = 22 f(x, y) and that f(tx, ty) = t? f(x, y) for all t. 4, Let f(x, y) = 3x2 - 2xy + y'. Find the expression of p = [f(x + h, y) - f(x, y)]/h and show that lim p = of h-+0 Ox

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