# Exam-Style Questions on Quadratic Equations

## Problems on Quadratic Equations adapted from questions set in previous exams.

### 1.

IGCSE Extended

(a) Show that the equation $$\frac{3}{x+1}+\frac{3x-9}{2}=1$$ can be simplified to $$3x^2-8x-5=0$$.

(b) Solve the equation $$3x^2-8x-5=0$$ showing all of your working and giving answers to three significant figures.

(c) The total surface area of a cone with radius $$x$$ and slant height $$8x$$ is equal to the area of a circle with radius r. Show that $$r = 3x$$.

[The curved surface area, $$A$$, of a cone with radius $$r$$ and slant height $$l$$ is $$A=\pi rl$$.]

### 2.

IB Studies

A red rug has a width of $$x-3$$ cm and a length of $$4x$$ cm.

(a) Write down an expression for the area, A, in cm2, of the rug.

The area of the rug is 3240 cm2.

(b) Calculate the value of $$x$$.

(c) Hence, write down the value of the length and of the width of the rug in centimetres.

The exam-style questions appearing on this site are based on those set in previous examinations (or sample assessment papers for future examinations) by the major examination boards. The wording, diagrams and figures used in these questions have been changed from the originals so that students can have fresh, relevant problem solving practice even if they have previously worked through the related exam paper.

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Kausar Begum Khan, Kenya

Friday, January 26, 2018

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