Review and practice of the next quadratic function in mathematics of grade 9 published by Jiangsu Education Press

Review and practice of the next quadratic function in mathematics of grade 9 published by Jiangsu Education Press

Unit volume of quadratic function
1、 Multiple choice questions:
1. The quadratic function y = X2 - (12-k) x + 12, when x > 1, y increases with the increase of X, when x