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IAL 2020 May FP1 Q2

A Level / Edexcel / FP1

IAL 2020 May Paper · Question 2

题目

Problem

2. The quadratic equation

5x22x+3=05x^2 - 2x + 3 = 0

has roots α\alpha and β\beta.

Without solving the equation,

(a) write down the value of (α+β)(\alpha + \beta) and the value of αβ\alpha\beta

(1)

(b) determine, giving each answer as a simplified fraction, the value of

(i) α2+β2\alpha^2 + \beta^2

(ii) α3+β3\alpha^3 + \beta^3

(4)

(c) determine a quadratic equation that has roots

(α+β2) and (β+α2)(\alpha + \beta^2) \text{ and } (\beta + \alpha^2)

giving your answer in the form px2+qx+r=0px^2 + qx + r = 0 where pp, qq and rr are integers.

(4)
题目中文翻译
  1. 二次方程

5x22x+3=05x^2 - 2x + 3 = 0

的根为 α\alphaβ\beta

不解方程,

(a) 写出 (α+β)(\alpha + \beta)αβ\alpha\beta 的值。

(b) 求下列各式的值(答案用最简分数表示):

(i) α2+β2\alpha^2 + \beta^2

(ii) α3+β3\alpha^3 + \beta^3

(c) 求一个二次方程,使其根为

(α+β2) 和 (β+α2)(\alpha + \beta^2) \text{ 和 } (\beta + \alpha^2)

答案写成 px2+qx+r=0px^2 + qx + r = 0 的形式,其中 ppqqrr 是整数。

解答