Math Problem Statement
23.(本小题满分 12 分)
在平面直角坐标系 xOy 中,点 P(2, -3) 在二次函数 y = ax^2 + bx - 3 (a > 0) 的图象上, 记该二次函数图象的对称轴为直线 x = m。
(1) 求 m 的值;
(2) 若点 Q(m, -4) 在 y = ax^2 + bx - 3 的图象上,将该二次函数的图象向上平移 5 个单位长度, 得到新的二次函数的图象。当 0 <= x <= 4 时,求新的二次函数的最大值与最小值的和;
(3) 设 y = ax^2 + bx - 3 的图象与 x 轴交点为 (x_1, 0)、(x_2, 0) (x_1 < x_2), 若 4 < x_2 - x_1 < 6,求 a 的取值范围。
Solution
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Math Problem Analysis
Mathematical Concepts
Algebra
Quadratic Functions
Graph Transformations
Symmetry Axis of Quadratic Functions
Roots of Quadratic Equations
Formulas
Quadratic function: y = ax^2 + bx + c
Symmetry axis formula: x = -b/2a
Quadratic equation solution formula: x = [-b ± √(b^2 - 4ac)] / 2a
Theorems
Vertex formula for quadratic functions
Quadratic formula for solving roots
Suitable Grade Level
Grade 10-12
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