confusion here, please help!

[geek101]

ahan... i guessed
wat does the mark scheme say?

i dunno a friend told me this but its was 1 i guess

 

[étudiante]

i dunno a friend told me this but its was 1 i guess

oh! i see
this question may not cum just hope dat
C1 is easy.............................................................................if u dont freak out n make silly mistakes so Chill

 

[Stancy Motha]

u silly ppl i will show u 3 methods to do it and get the ans without getting muddled up

1) 1=8-12+4-C
1-8+12-4=-C (Bring all the numbers to one side and keep the unknown in the other side)
1+12-8-4=-C (Do the addition first according to BODMAS)
13-12=-C...... (Simplify)
1=-C .............(Change all signs)
C=-1

2) C=8-12+4-1 (re-arrange, leaving the unknown +ve)
C=8+4-12-1.... (BODMAS)
C=-1

3) ~ THe- EASIEST-OF- ALL-METHODS~
1=8-12+4-C (8+4=12
.....................12-12=0)
1=-C
C=-1

 

[étudiante]

oh yh... just wanted to add that edexcel c1 paper is immensely easy (equivalent to A* GCSE and a few additional things) especially if you have done sufficient amount of revision... so if you can cut out the silly mistakes it should be pretty easy. Good luck though!

true dat! u all should aim high n try 4 centums
It'll help u in ur overall grade cuz C4 is..............................well lets say its not a breeze

 

[Stancy Motha]

There is one small and simple mistake with your calculation. Even I got baffled to why you got 9 and then I realized the mistake was pretty silly.

you said 1 = 8 -12 +4 - C (ok)

C= 8-12+4-1 (this is fine too)

but -12+4 = -8 and not -16

so this step : =8 - 16 -1 (is sadly wrong)

its actually = 8 -8 -1

C=-1

I hope that clears up why 9 even came up when it actually can't!

And can u believe no one else saw that???