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Directions: Transform the following quadratic equation into vertex form.
1. f(x) = x² + 4x + 5
4. f(x) = x² – 2x + 6
2. f(x) = 2x² – 10x + 6
5. f(x) = 4x² + 3x + 2
3. f(x) = 3x² – 4x + 1​