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1. what are the values of h and k in the Quadratic function y= 2x² + 20x + 47?
2. what is the vertex form of the quadratic function y=-3x²-6x-12?
3. which of the following quadratic function has -4 and 5 as the values of h and k, respectively?
4. what formula can be used to find the values of h and k given the quadratic function y= ax²+bx+c?​