Monday

April 21, 2014

April 21, 2014

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

(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 12:46pmSince 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))

**Related Questions**

Math - Reiny can you show me how to check this problem. 5a^8-20a^7-25a^6 =5a^6(a...

math-calculus - 5a-3/a+7 = 5a-14/a+1 so i find that only lowest common ...

Math - Find the HCF 1) 7x and 9 : nothing 2) x^2(x-4) and x(x-4) : its (x-4)? 3...

Algebra 12345!!! - (5a^3b^4)2 would it be: 10a^6b^8 five squared is 25, and ...

algebra - Subtract (5a^3+a-3)-(8-3a^3-5a^2)

Math - (2,14),(1,-1),(3,35) Find the quadratic function y=ax^2+bx+c 1) 4a+2b+c=...

Math - Use the distributive property of multiplication over addition to rewrite ...

Math - Simplify: square root of 25a^2 I have the answer as 5a is that right?

Math~Polynomials - 1)6g+8k-9g+2k(1point) 3g+10k -3g+10k*** 17gk 10k-3 2)-4x+6x^2...

algebra - multiply and simplify 5a^7. 6q^5 4q^2 25a