Can you help me find the domain of these expressions?

1.) -x^4+x^3+9x

2.) 2r^2-5/3r+6

3.) 1/sqrt(x-1)

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- September 1st 2010, 08:56 PMDHS1Find the domain of the expression.
Can you help me find the domain of these expressions?

1.) -x^4+x^3+9x

2.) 2r^2-5/3r+6

3.) 1/sqrt(x-1) - September 1st 2010, 09:05 PMundefined
- September 1st 2010, 09:22 PMDHS1
- September 1st 2010, 09:29 PMundefined