Subtract. Express your answer in simplest form.
3x/x - 9 minus 27/x - 9
2006-11-21 15:12:25 · 6 answers · asked by George F 1 in Science & Mathematics ➔ Mathematics
3x/(x - 9) - 27/(x - 9)
= 3x-27/(x - 9)
= 3(x - 9)/(x - 9)
= 3
2006-11-21 15:17:48 · answer #1 · answered by Tom :: Athier than Thou 6 · 0⤊ 0⤋
I think u mean
(3x / (x-9)) - (27 / (x-9) ) =
(3x - 27 ) / ( x - 9) =
3(x-9) / (x-9) = 3
2006-11-21 15:24:20 · answer #2 · answered by M. Abuhelwa 5 · 0⤊ 0⤋
3x/x-9-(27/x-9) as written
3x/x-9-27/x+9
3-27/x
if you meant 3/x instead of 3x/x
3/x-9-(27/x-9)
3/x-9-27/x+9
-24/x
2006-11-21 15:18:28 · answer #3 · answered by yupchagee 7 · 0⤊ 0⤋
3x-27/x-9=3(x-9)/x-9=3
2006-11-21 17:46:09 · answer #4 · answered by sam 3 · 0⤊ 0⤋
Which is it?
3x/x - 9 minus 27/x - 9 ||||or||||* 3x/x - 9 minus 27/x - 9
3x/x - 9 - 27/x - 9 ||||||||||||||||||||||| (3x/x - 9) - (27/x - 9)
3(x/x - 3 - 9/x - 3) ||||||||||||||||||||||| 3x/x - 9 - 27/x + 9
3 (1 - 3 - 9/x - 3) |||||||||||||||||||||||| 3x/x - 27/x
-3 (9/x + 5) ||||||||||||||||||||||||| 3 * x/x - 27/x
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| 3 - 27/x -or- 3( 1 - 9/x)
The other possibility (and what you probably mean):
(3x/(x-9)) - (27/(x-9))
= (3x - 27)/(x-9)
= 3(x-9)/(x-9)
= 3
2006-11-21 15:28:51 · answer #5 · answered by gauger_1 3 · 0⤊ 0⤋
First thing when you subtract fractions is to make sure they have a common denominator (they do: x-9) then subtract the numerator and put that result over the common denominator. (same process as adding)
2006-11-21 15:17:16 · answer #6 · answered by SilverRAM 3 · 0⤊ 0⤋