document.write( "Question 72215: Perhaps if I could know how to do a problem like this one, I could figure out how to do the others like this. Thanks for any help.\r
\n" ); document.write( "\n" ); document.write( "Find the domain of the expression. \r
\n" ); document.write( "\n" ); document.write( " $\"+t%5E3-4t%5E2%2B1+\"$ \n" ); document.write( "

Algebra.Com's Answer #51651 by jim_thompson5910(35256) $\"\"$ $\"About$

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The domain is all allowable inputs that will result in the function outputting a real number. If I can plug in a number for a function and get an answer (a real number) then that number is in my domain. Since any real number can work in $\"+t%5E3-4t%5E2%2B1+\"$ (it's not the same for all equations) the domain is x is the set of all real numbers (any number will work). Problems like 1/x are somewhat similar but with one big difference. If I put 0 in for x I get 1/0, which is not possible. Think, what number do I multiply 0 by to get 1 ? There is no such number (0*anything is always 0), so 0 is not in my domain. \n" ); document.write( "

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