URGENT!!)please help- modulus c3

Hi, i'm really in a hurry please help me

how to you solve

lx-2l - ( lxl - 2) ???

what are the rule of adding and subtracting modulus?

I tried squaring the modulus but i don't think thats how it works.

also they ask to sketch it.....

how on earth do i do that please help me my exam is tomorrow

Reply 1

Kevin De Bruyne

21

Original post by liemluji

Hi, i'm really in a hurry please help me

how to you solve

lx-2l - ( lxl - 2) ???

what are the rule of adding and subtracting modulus?

I tried squaring the modulus but i don't think thats how it works.

also they ask to sketch it.....

how on earth do i do that please help me my exam is tomorrow

Are you being asked to find

|x-2| - |x| - 2

? Are you also asked to sketch y = ...?

Reply 2

liemluji

OP

7

Original post by SeanFM

Are you being asked to find

|x-2| - |x| - 2

? Are you also asked to sketch y = ...?

yes

Reply 3

Kevin De Bruyne

21

Original post by liemluji

yes

For solving it, I would suggest taking cases. :dontknow:

For sketching it - also take cases.

By cases, I mean, ranges of values of x so that you can work out what the modulus is of x-2 and x for those regions, and how you can combine them.

For example, one case would be when

x \geq 2

. Whenever that is true, you can have an algebraic expression for x as mod(x-2) = x-2 and mod(x) = x.

The second case would be

0 \leq x \leq 2

and the expression would be...

and then there are 2 more cases to consider.

Latex doesn't want to work.. sorry! \geq means greater than or equal to and \leq less than or equal to.

(edited 7 years ago)

URGENT!!)please help- modulus c3

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