Solve: x+2/5 - x-2/7 = 4
PLEase explain thoroughly. THANKS!!!!!
2007-01-16 12:43:47 · 7 answers · asked by Orange? 4 in Science & Mathematics ➔ Mathematics
there us no typo! i checked it like 20 times. just write it out how i typed it. It would look like x+2 over 5 - x-2 over 7 = 4...Sorry if you cant understand it..but thanks for trying!!
2007-01-16 12:53:47 · update #1
also there are A B C D
[A] 58
[B] 68
[C] -10
[D] 0
2007-01-16 12:56:06 · update #2
The people above me answered the question as written and they are correct. This is what happens when you don't use parentheses to eliminate ambiguity.
I suspect you meant:
Solve (x + 2)/5 - (x - 2)/7 = 4
If this is the case, first clear the denominators by multiplying both sides of the equation by the least common multiple, namely 35.
7(x + 2) - 5(x - 2) = 4*35
7x + 14 - 5x + 10 = 140
2x = 116
x = 58
Next time, please use parentheses.
2007-01-16 12:58:19 · answer #1 · answered by Northstar 7 · 0⤊ 0⤋
move the - (x-2)/7 to the other side so that u get
(x+2)/5=(x-2)/7 +4 .....note how the sign changed when u slid it to the other side.
on the right side u must combine the two terms. the first term denominator is 7 and the 4's denominator is one. common denominator is 7. so u times 4 by 7 and 28/7 now u have common denom. and can combine numerators. ...
x+2)/5=(x-2)+28/7 simplify. .....(x+2)/5=(x+26)/7 now cross multiply as u have a proportion...u get 7x+14=5x+130. i am guessing u can solve that. psst. the answer is 58
2007-01-16 20:57:18 · answer #2 · answered by robert s 5 · 0⤊ 0⤋
x + 2/5 - x - 2/7 = 4
2/5 - 2/7 = 4
14/35 - 10/35 = 4
4/35 can't equal 4, so this must be a typo
2007-01-16 20:48:39 · answer #3 · answered by danjlil_43515 4 · 0⤊ 0⤋
Oh man ! What kind of math is that ???
It 's toooooo easyyyyyyy !
In Viet Nam,I did learn it when I am in 2nd grade !!!
x + 2/5 - x - 2/7 = 4
(x - x) + (2/5 - 2/7 -4 ) = 0
0x + (-136/35) = 0
-136/35 = 0 (illogical)
There's no x which is suitable !!!
T=
2007-01-16 20:52:40 · answer #4 · answered by crystal_heart100 5 · 0⤊ 0⤋
gather like terms: x-x+(2/5)-(2/7)=4
simplify: (2/5)-(2/7)=4
thats nowhere close, so the equation is false....
if you meant: (x+2)/5 - (x-2)/7=4
multiply through by 35: 7(x+2) - 5(x-2)=140
distribute: 7x+14-5x+10=140
simplify: 2x+24=140
subtract 24: 2x=116
divide by 2: x=58
2007-01-16 21:00:37 · answer #5 · answered by Veer 3 · 0⤊ 0⤋
You've made an error in your transcription of the problem. 2/5-2/7 does not equal 4.
2007-01-16 20:48:02 · answer #6 · answered by mjatthebeeb 3 · 0⤊ 0⤋
First combine like terms (as in x)
x+2/5 - x - 2/7= 4
oh...x would cancel out... umm...yeah that equation has like no solution or something because 4/25 doesnt = 4...so I dont know about that one thats a weird problem.
2007-01-16 20:48:29 · answer #7 · answered by Alex 2 · 0⤊ 0⤋