# Quadratic Equation and Marks

**Topics:**Quadratic equation

**Pages:**28 (934 words)

**Published:**January 2, 2012

Instructions: 1. Write your name, class and class number in the spaces provided on this cover. 2. This paper consists of THREE sections, A(1), A(2) and B. Each section carries 20 marks. 3. Attempt ALL questions in this paper. Write your answers in the spaces provided. Supplementary answer sheets will be supplied on request. Write your name and class number on each sheet. 4. Unless otherwise specified, all working must be clearly shown. 5. Unless otherwise specified, numerical answers should either be exact or correct to 3 significant figures. 6. The diagrams in this paper are not necessarily drawn to scale.

Page 1 of 9

Section A(1) (20 marks)

3n − 5m =4. 2

1.

Make n the subject of the formula

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___________________ 2. Calculate

(−3 + 5i ) × (2 + 7i ) . 4 + 8i

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___________________ Factorize (a) 2r 2 + 20r + 50 , (b) r 2 + 10r + 25 − s 2 . (4 marks) ____________________________________________________________

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