Posted by **Ruthie** on Wednesday, December 7, 2011 at 12:12pm.

perform indicated operations.

(a+3)/(5a+25)-(a-1)/(3a+15)

(a+3)/5(a+5)-(a-1)/3(a+5)=(a+3)5(a+5)/5(a+5)3(a+5)-(a-1)5(a+5)/5(a+5)3(at5)= 5a^2+25a+15a+75+5a^2+25a-5a-25/5(a+5)3(a+5)

i got (10a^2+60a-50)/5(a+5)3(a+5)and that's wrong. where did i go wrong?

- math -
**Steve**, Wednesday, December 7, 2011 at 12:43pm
(a+3)/(5a+25)-(a-1)/(3a+15)

(a+3)/5(a+5)-(a-1)/3(a+5)

=(a+3)**3**(a+5)/5(a+5)3(a+5)-(a-1)5(a+5)/5(a+5)3(a+5)

Aside from that, I'd not include (a+5) twice, making it

=3(a+3)/15(a+5) - 5(a-1)/15(a+5)

= (3a+9-5a+5)/15(a+5)

= 2(7-a)/15(a+5)

- math -
**Reiny**, Wednesday, December 7, 2011 at 12:46pm
Since the a+5 is already common, you don't need it twice

LCD = 15(x+5)

so your second line

= 3(a+3)/(15(a+5)) - 5(a-1)/(15(a+5))

= (3a+9 - 5a + 5)/(15(a+5))

= (-2a + 14)/(15(a+5))

=-2(a-7)/(15(a+5))

## Answer This Question

## Related Questions

- Calculus; Limits - Evaluate limit, x -> a, [(x + 4a)^2 - 25a^2] / [x - a] My ...
- Math - Simplify 25a³b - 10a²b³ + 19b² -10a³b + 30a²b³ - 29b² and factor. I got ...
- math - 10a^2 + 25a - 15 factor out the GCF.
- algebra - simplify the folowing. assume a,x and y are not zero... 15a^3/25a
- Algebra 1 - Perform the indicated operations and simplify. 3z^2 - z - 2/6z^2 - ...
- math - a) 25a^2 - 16a^2 b^2 b) x^2 - (a+b)^2 c) 9(x-y)^2 - z^2 d) 16x^4 - 81y^4...
- math- please help! - Please help with these 5 problems! I have the solutions but...
- Math - Perform the indicated operations and write in standard form. Sq root of -...
- math - Simplify and show: 2a-6(10a)-5a^2(2) ----------------- (2a-6)^2 This is ...
- math correction - Directions: Perform the indicated divisions. The problem: (8x^...

More Related Questions