英语翻译In the xy-coordinate plane,P and Q are different points that have the same y-coordinate and lie on the parabola whose equation is y=x^2-3x-40.What is the x-coordinate of the midpoint of PQ?

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英语翻译In the xy-coordinate plane,P and Q are different points that have the same y-coordinate and lie on the parabola whose equation is y=x^2-3x-40.What is the x-coordinate of the midpoint of PQ?
英语翻译
In the xy-coordinate plane,P and Q are different points that have the same y-coordinate and lie on the parabola whose equation is y=x^2-3x-40.What is the x-coordinate of the midpoint of PQ?

英语翻译In the xy-coordinate plane,P and Q are different points that have the same y-coordinate and lie on the parabola whose equation is y=x^2-3x-40.What is the x-coordinate of the midpoint of PQ?
在xy平面里,P、Q为纵坐标相同的两点,并且P、Q两点在抛物线y=x^2-3x-40上.求线段PQ中点的横坐标.
自己参考吧：Xm=1/2(Xp+XQ).利用抛物线的symmetry（对称性）,Xm=1/2*2*[-(-3/2)]=1.5

在xy座标平面上， P和Q是两个不相同的点，但有著相同的Y座标，并且同样处於等式y=x^2-3x-40的parabola（就是那个U型的线，中文不知道叫甚麼不好意思。）上面。请问PQ中间点的X座标是甚麼？

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