7. (8%) Let \( f(x, y, z) = \sqrt{x^2 + 2y^2 + 3z^2} \). Find \( \nabla f \) and the value of \( \nabla f \) at the point \( (1, -2, 3) \).
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7. (8%) Let \( f(x, y, z) = \sqrt{x^2 + 2y^2 + 3z^2} \). Find \( \nabla f \) and the value of \( \nabla f \) at the point \( (1, -2, 3) \).