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# Multiplying negatives. Basic maths watch

1. So I'm confused about something.
Lets say I'm doing a question on simplifying fractions.
What is the rule with multiplying a part of a fraction to cancel it down?
Can I multiply the denominator or numeration?
Here's a example: I have y(x-1)/1-x
So can I assume that I can't multiply the denominator to simplify?
Thanks!
2. (Original post by wcschstudent)
Lets say I'm doing a question on simplifying fractions.
What is the rule with multiplying a part of a fraction to cancel it down?
Can I multiply the denominator or numeration?
Here's a example: I have y(x-1)/1-x
So can I assume that I can't multiply the denominator to simplify?
Thanks!
Cannot multiply the denominator by what?
3. y(x-1)/(1-x)= (-y)(1-x)/(1-x)
4. I think the best way for you to think about this is to cancel common factors in the numerator and denominator. This may require you to do some factorization.

eg
5. (Original post by Ateo)
I think the best way for you to think about this is to cancel common factors in the numerator and denominator. This may require you to do some factorization.

eg
Ahh thanks!

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