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In the xy-plane, the graph of y = 2x2 + hx - 6 passes through the point (-3, -21), what is the value of h ?____
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解析：
因为(-3, -21)经过二次方程式，所以-21 = 2(-3)2 + h(-3) – 6，-21 = 18-3h-6= 12-3h，-33 =-3h，h = 11。
因为(-3, -21)经过二次方程式，所以-21 = 2(-3)2 + h(-3) – 6，-21 = 18-3h-6= 12-3h，-33 =-3h，h = 11。
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