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CIE 9709 2023 June Paper 11 Q11

A Level / CIE / P1

CIE 9709 2023 June Paper 11 Paper · Question 11

题目

Problem

The equation of a curve is such that dydx=6x230x+6a\frac{\mathrm{d}y}{\mathrm{d}x}=6x^2-30x+6a, where aa is a positive constant. The curve has a stationary point at (a,15)(a,-15).

(a) Find the value of aa.

[2]

(b) Determine the nature of this stationary point.

[2]

(c) Find the equation of the curve.

[3]

(d) Find the coordinates of any other stationary points on the curve.

[2]
题目中文翻译

一条曲线满足 dydx=6x230x+6a\frac{\mathrm{d}y}{\mathrm{d}x}=6x^2-30x+6a,其中 aa 为正常数。该曲线在 (a,15)(a,-15) 处有一个驻点。

(a) 求 aa 的值。

(b) 判断这个驻点的性质。

(c) 求该曲线的方程。

(d) 求该曲线上任何其他驻点的坐标。

解答