# C3 maths- Modulus

- Created by: Delia
- Created on: 19-09-13 11:42

First 147 words of the document:

OCR C3 Mathematics 1

The Modulus Function

Reflect any negative part of the graph when it is a modulus graph

Key Rules

|axb|= |a| x |b|

|a/b|= |a| / |b|

|x2|= |x|2= x2

Solving Equations

Type A modulus= constant

|x1|=4

X1=4 x1=4

X=5 x=3

Type B modulus= modulus

|x2|=|x4| (square both sides)

X24x+4=x28x+16 (move around to get x on one side numbers on other)

4x=12 (divide all by 4)

X=3

Type C modulus= function of x

|x1|=2x

Draw both graphs and see where the intercept...

If they intercept on the negative part of the modulus graph (the reflection) then it would be

(x1)=2x

x+1=2x

X=1/3

If they intercept on positive part of graph then solve normally,

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