12 Let a be a positive number, let : [2,) R, f(x) = ax and...

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12 Let a be a positive number, let ƒ: [2,∞) → R, f(x) = ax and let g: (-∞0, 1] → R, g(x) = x² + a. Find all values of a for which both fog and g of exist. 12 Let a be a positive number, let ƒ: [2,∞) → R, f(x) = ax and let g: (-∞0, 1] → R, g(x) = x² + a. Find all values of a for which both fog and g of exist.