Chapter 3- Inequalities and simultaneous equations (Pure Maths)

Question 1

how to change the direction of a inequality?

Answer 1

multiplying or dividing by negative numbers changes the direction of the inequality sign.

Question 2

How to write in interval notation? e.g 1< x ≤2

Answer 2

( round bracket means its not included
[ means number is included

1< x ≤2
is
(1,2]

Question 3

how to write set notation? e.g x ≤ 2

Answer 3

x ≤2
{x:x≤2}