Posted by **Juli** on Sunday, November 25, 2012 at 4:31pm.

Write each rational expression in simplest form and list the values of the variables for which the fraction is undefined.

1. x^2-7x+12/x^2+2x-15

2. 5y^2-20/y^2+4y+4

3. -7+7a/21a^2-21

4. 5(1-b)+15/b^2-16

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