Posted by **Marysvoice** on Wednesday, January 23, 2008 at 8:02am.

-9+3w/11 divided by 25w-75/121

Do I need a Common denominator?

Would it be 121 as 11x11 is 121?

Do I then multiply the numeratos- -9+3w by 11 or do I do the addition of -9+3w for-12w?

- Algebra -
**Reiny**, Wednesday, January 23, 2008 at 8:23am
No, in division and multiplication you do not need a common denominator.

Remember that when you divide by a fraction you instead multiply by the reciprocal of that fraction

so...

(-9+3w)/11 divided by (25w-75)/121

=(-9+3w)/11 * 121/(25w-75)

=3(-3+w)/11 * 121/(25(w-3))

=33/25 , with x not equal to 3

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