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CIE 9709 2024 June Paper 11 Q6

A Level / CIE / P1

CIE 9709 2024 June Paper 11 Paper · Question 6

题目

Problem

The function ff is defined by f(x)=2x2+4f(x) = \frac{2}{x^2} + 4 for x<0x < 0. The diagram shows the graph of y=f(x)y = f(x).

(a) On this diagram, sketch the graph of y=f1(x)y = f^{-1}(x). Show any relevant mirror line.

[2]

(b) Find an expression for f1(x)f^{-1}(x).

[3]

(c) Solve the equation f(x)=4.5f(x) = 4.5.

[1]

(d) Explain why the equation f1(x)=f(x)f^{-1}(x) = f(x) has no solution.

[1]
题目中文翻译

函数 ff 定义为 f(x)=2x2+4f(x) = \frac{2}{x^2} + 4,其中 x<0x < 0。图中显示 y=f(x)y = f(x) 的图像。

(a) 在该图上,画出 y=f1(x)y = f^{-1}(x) 的图像。标出任何相关的镜像线。

[2]

(b) 求 f1(x)f^{-1}(x) 的表达式。

[3]

(c) 解方程 f(x)=4.5f(x) = 4.5

[1]

(d) 解释为什么方程 f1(x)=f(x)f^{-1}(x) = f(x) 无解。

[1]

解答