I am suppose to find all the nonpermissable replacemnets that make the radical expressions undefined.
y the third power plus 125 over y
1) y^3 +125/y

Next I need to write each expression in lowest terms.
6x to the second power minus 2x over 2x
2) 6x^2 -2x/2x

x to the second power minus 7x plus 12 over x to the second power minus 9x plus 20
3) x^2 -7x +12/x^2 -9x +20

a to the second power minus b to the second power over a the third power plus b to the third power
4) a^2 -b^2/a^3 +b^3

What is your question?