Sketch the curve with equation , indicating clearly the coordinates of any points of intersection with the axes and the equations of any asymptotes.
The curve undergoes a sequence of three transformations as follows:
I: A scaling parallel to -axis with a scale factor of 4,
II: A scaling parallel to -axis with a scale factor of ,
III: A translation of 2 units in the positive -direction.
Find the equation of the resulting curve.
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Worked solution
1. 求曲线 $C$ 与坐标轴的交点坐标以及渐近线方程
曲线 的方程为 。
- 与 轴的交点:令 ,得 。
故与 轴的交点坐标为 和 。 - 与 轴的交点:令 ,得 ,无实数解,故曲线与 轴没有交点。
- 渐近线方程:令 ,得 ,即渐近线方程为 和 。
2. 绘制曲线 $C$ 的草图
曲线 为双曲线,中心在 ,顶点坐标为 和 。
画图时需清晰标出:
- 顶点 和 ;
- 与 轴的交点 和 ;
- 两条渐近线 和 。
3. 对曲线 $C$ 依次施加三种变换并求出最终方程
原曲线 方程为 。
- 变换 I(沿 轴方向伸缩,伸缩比例为 4):用 替换 ,得到方程:
- 变换 II(沿 轴方向伸缩,伸缩比例为 ):用 替换 ,得到方程:
- 变换 III(沿 轴正方向平移 2 个单位):用 替换 ,得到方程:
Answer
曲线 的坐标轴交点为 和 ,渐近线方程为 和 (无 轴交点);变换后的曲线方程为 。
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