Need help, very last algebra question!? - XP Math - Forums

 XP Math - Forums Need help, very last algebra question!?

 07-24-2007 #1 lexisayn Guest   Posts: n/a Need help, very last algebra question!? 2..................x_____ +_____5x-45.....x^2-81Please if anyone can help me and show the work, I would be grateful!
 07-24-2007 #2 ~You are junk~ Guest   Posts: n/a i am going into eigth grade..so i dont' do that stuff till like seinor year probably
 07-24-2007 #3 MamaMia Guest   Posts: n/a 2/(5x + 45) + x/(xÂ²-81)= 2/5(x-9) + x/(x+9)(x-9)= 2(x+9)/5(x+9)(x-9) + 5x/5(x+9)(x-9)= [2(x+9) + 5x] / 5(x+9)(x-9)= 2x + 18 + 5x / 5(x+9)(x-9)= 7x + 18 / 5(x+9)(x-9)
 07-24-2007 #4 psycho_x52 Guest   Posts: n/a 5x-45=5(x-9)x^2-81=x^2-9^2=(x-9)(x+9)you'll get (7x+18)/5(x+9)(x-9)This equation must have a result, otherwise this is the simplest form you can achieve.
 07-24-2007 #5 jurassicko Guest   Posts: n/a 2..................x_____ +_____5x-45.....x^2-81I assume you mean:2..................x_____ +_____5x-45.......xÂ²-81simplify/factorise the denominators,2..........................x_______ +_________5(x - 9)........(x + 9)(x - 9)make the denominators the same,2*(x + 9).......................x*5___________ +____________5(x - 9)(x + 9)........5(x + 9)(x - 9)2x + 18 + 5x___________5(x - 9)(x + 9)7x + 18____________5(x - 9)(x + 9)

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