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September 16, 2014

September 16, 2014

Posted by **B.B.** on Thursday, May 6, 2010 at 2:08pm.

I will show you what I have so far.

Perform the indicated operations and simplify.

w-2/w-7-w+1/w+7+w-77/w^2-49

I made it to this step and now I can't figure out what to do next.

w^2+w-14/(w+7)(w-7) + w^2-6w-7/(w+7)(w-7) + w-77/(w+7)(w-7)=(w^2+w-14)+(w^2-6w-7)+(w-77)/(w+7)(w-7)= 4w-98/(w+7)(w-7).

This is where I'm lost at. I can't seem to figure out the end result.

Thanks for the help.

- Math -
**Reiny**, Thursday, May 6, 2010 at 3:46pmOnly after looking at your solution was I able to figure that your really meant....

(w-2)/(w-7) - (w+1)/(w+7) + (w-77)/(w^2-49)

= [(w^2 + 5w - 14) - (w^2 - 6w - 7) + w-77 ]/[(w+7)(w-7)]

= (12w - 84)/[(w+7)(w-7)]

= 12(w-7)/[(w+7)(w-7)]

= 12/(w+7) , w ≠ 7 (or else we divided by zero)

- Math -
**B.B.**, Thursday, May 6, 2010 at 3:59pmThanks but I figured out where I made my mistake and got the answer.

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