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ZX-A445180A042023年12月A卷 · 第 21 题
2023年12月A卷 · 原库模块 2 · Q21 原库参考解析
Function f is a quadratic function. The graph of y=f (x) in the xy-plane has a vertex at (9, -7), contains the point (8, -9), and has a y-intercept at (0, a). The graph of y=6· f(x) has a y-intercept at (0, b). What is the positive difference between a and b?
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