Stupid mistake? (1 Viewer)

[Brad]

I think i fucked up this little thing in my trial today... i already realised that i fucked up at least one so there goes the 100% and i also realised another little fuck up of cos^2@= 1/2
:. cos@ = 1/rt2
NOT +- root 2 FUCK!!!


This is the one which i wasnt sure about:

Simplify:
__x__ _ __2___
x^2-4 (x-2)

The simplified i got wasnt very simplified, im not really sure

 

[redslert]

hmmm

cos^2@ = 1/2
[cos @]^2 = 1/2
cos @ = +- 1/rt(2)
@ = 45', 135'

so it IS +-


x/(x^2 - 4) - 2/(x - 2) = 0
(x^2 - 2x - 2x^2 + 8) / (x^2 - 4)(x - 2)
(-x^2 -2x +8) / (x^2 - 4)(x - 2)
-(x^2 + 2x -8) / (x^2 - 4)(x - 2)
-(x - 2)(x + 4) / (x^2 - 4)(x - 2)
-(x + 4) / (x^2 - 4)

 

[Brad]

Haha score thats what i got for the second one, it just didnt look simplified enough... yeah i realised that i forgot the plus or minus sign

 

[RyddeckerSMP]

Can't you just do this?
x/(x^2 - 4) - 2/(x - 2)
x/(x+2)(x-2) -2(x+2)/(x-2)(x+2)
x-2x-4/(x+2)(x-2)

 

[Brad]

Yeah, but i was thinking... hmmmm this doesn't seem to be very simplified.. it looked as though something was meant to cancel... but thats what i got anyways so its all good

 

[redslert]

Can't you just do this?
x/(x^2 - 4) - 2/(x - 2)
x/(x+2)(x-2) -2(x+2)/(x-2)(x+2)
x-2x-4/(x+2)(x-2)

yes you can
but either way you still get the same solution