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AQA A Level Maths: Pure复习笔记2.4.1 Linear Inequalities
Category:
A-level课程
,
教材笔记
,
福利干货
Date: 2022年7月21日 下午2:59
Linear Inequalities
What are linear inequalities?
Linear inequalities are similar to equations but answers take a range of values
Linear means there will be no terms other than degree 1
no squared terms or higher powers, no fractional or negative powers
Inequalities use the symbols following symbols
> Greater than e.g. 5>3
< Less than e.g. -8<7
≥ Greater than or equal to
≤ Less than or equal to
Inequalities can be represented in many ways using number lines, set notation and interval notation
Number line diagrams
Number line diagrams are made up from circles and lines set above a number line
A filled-in circle or empty circle above a number denotes whether the number is included or not
filled in for the greater/less than or equal to symbols ≤ ≥
empty for the greater/less than symbols < >
Arrows show the range of values that are allowed
Set notation
Set notation is a formal way of writing a range of values
Use of curly brackets { }
Intersection ∩ and union ∪
may be used
Not to be confused with interval notation
Interval notation
Interval notation uses different brackets to indicate whether a number is included or not
Use of square [] and round () brackets
[ or ] mean included
( or ) mean excluded
(4,8] means 4 < x < 8
Note ∞ always uses ( or )
Not to be confused with set notation
Skills for solving linear inequalities
representing and interpreting inequalities displayed on a number line
writing and interpreting set notation
eg {x : x > 1} ∩ {x : x ≤ 7} is the same as 1 < x ≤ 7
writing and interpreting interval notation
eg [-4, 6) is the same as -4 ≤ x < 6
How do I solve linear inequalities?
Treat the inequality as an equation and solve
avoid multiplying or dividing by a negative
if unavoidable, “flip” the inequality sign so < → >, ≥ → ≤, etc
try to rearrange to make the x term positive
Worked Example
转载自savemyexams
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Next post: AQA A Level Maths: Pure复习笔记2.4.2 Quadratic Inequalities
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