2007-07-27 13:28:28 · 6 answers · asked by Poohbear1113 1 in Science & Mathematics ➔ Mathematics
(5 - x) / (x - 5) (x + 5)
- (x + 5) / (x - 5) (x + 5)
- 1 / (x + 5)
2007-07-31 11:33:24 · answer #1 · answered by Como 7 · 0⤊ 0⤋
5-x over x^2-25
5-x over (5-x)(5+x) factoring
cancell 5 - x the remaining is:
1 over 5+x
2007-07-27 21:06:30 · answer #2 · answered by Anonymous · 0⤊ 0⤋
(5 - x) / (x^2 - 25)
-(x - 5) / (x^2 - 25)
-(x - 5) / (x+5)(x-5)
-1 / (x+5)
In general, remember that (a+b)(a-b) = a^2 - b^2. It also helps to remember that (a+b)(a+b) = a^2 + 2ab + b^2, that (a-b)(a-b) = a^2 - 2ab + b^2, and that a^2 + b^2 isn't factorable.
2007-07-27 20:32:09 · answer #3 · answered by Anonymous · 2⤊ 0⤋
Geezah answered this well.
It's an easy rule for algebra students to forget, that:
(a - b) = - (b - a)
example:
(5 - x) = - (x - 5)
Keep that rule in mind. It pops up ALOT, especially in reducing fractions like you're doing now.
2007-07-27 20:35:29 · answer #4 · answered by mathgoddess83209 3 · 0⤊ 0⤋
HINT: x^2 - 25 can be re-written in the form a^2 - b^2, which equals (a+b)(a-b)
2007-07-27 20:32:09 · answer #5 · answered by Optimizer 3 · 0⤊ 0⤋
5-x/x^2-25
or -(x-5)/(x-5)(x+5)
or -1/(x+5) ans
2007-07-27 20:43:58 · answer #6 · answered by MAHAANIM07 4 · 0⤊ 0⤋