2026年5月国际A卷 · 第 5 题

2026年5月国际A卷 · 原库模块 2 · Q5 原库参考解析

The table shows three values of x and their corresponding values of y. There is a quadratic relationship between x and y. An equation that represents this relationship can be written as \( y=27x^2-bx-18 \), where b is a constant. What is the value of b?