Determine the open intervals on which the graph is concave upward or concave downward. f(x) = x² + ² - 1 Concave upward: O (-1, 1) 0 (-00,00) ○ (-∞, -1) U (1, ∞⁰) O (-∞, -1) O none of these Concave downward: O (-∞, -1) O (-1, 1) O (-∞, -1) U (1, ∞) 0 (-∞0, ∞o)

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