Ocr Maths C3

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  • Created by: Delia
  • Created on: 19-09-13 12:12

The Modulus Function

It returns the absolute value of x eg |-3|= 3 |5|= 5

On a graph it is obtained by reflecting the negative part of the graph

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Key Rules

|axb|= |a| x |b|

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

|x^2|= |x|^2= x^2

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Solving Equations

Type A

|x+1|=4 (modulus= constant) (SEE NOTES!)

solve algebraically

Type B

|X+2|=|2X-5| (modulus= modulus) (SEE NOTES)

square both sides

Type C

|x-1|=2x (modulus= function of ex) (SEE NOTES!)

Must be solved Graphically

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