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ZX-2CEEAE38F52025年6月美国A卷 · 第 20 题
2025年6月美国A卷 · 原库模块 2 · Q20 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 (4, -6), contains the point (3, -8) , and has a y-intercept at (0, a) . The graph of \( y=5·f(x) \) has a y-intercept at (0, b). What is the positive difference between a and b?
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