forgot how to simplify equations like 40((1/x)-(1/(x+40)))= 1/3 and (1000/x)-(1000/(x-120)) = 1/2 Please help!

Question

forgot how to simplify equations like 40((1/x)-(1/(x+40)))= 1/3 and (1000/x)-(1000/(x-120)) = 1/2  Please help!

saifoo.khan · Answer

WOW, thts 

$$\Huge HUGE$$

lol.

anonymous · Answer

you're cute :-)

I forgot how to simplify such equations too :-(

saifoo.khan · Answer

Lol, i thought u knew the answer.. 

well, asker.. please write the ques more clearly.. i will solve it for u..
or join me in my class.

anonymous · Answer

plugging in those equations in wolf gives really tough answers :-P

anonymous · Answer

someone....? please give me an answer? I'm really stuck

anonymous · Answer

first one: http://www.wolframalpha.com/input/?i=40%28%281%2Fx%29-%281%2F%28x%2B40%29%29%29%3D+1%2F3 second one: http://www.wolframalpha.com/input/?i=%281000%2Fx%29-%281000%2F%28x-120%29%29+%3D+1%2F2

anonymous · Answer

errrm... yeah I think I get it but...still a bit confused... don't worry then

anonymous · Answer

Trust me, everybody here is as confused as you are about solving such equations.

anonymous · Answer

attachment

anonymous · Answer

40((1/x)-(1/(x+40)))= 1/3

40/x -40/(x+40) = 1/3

(40(x+40)-40x) / x(x+40) = 1/3

1600/x(x+40) = 1/3

4800= x^2 +40x

x^2+40x-4800 = 0 quadratic.