document.write( "Question 778286: I'm trying to figure out the domain of this function without a graph.
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document.write( " I tried making it greater than or equal to zero and I ended up with X being less than 4. I'm not sure if it was supposed to be less than or greater than. Mostly I'm confused about the process of finding a domain like this. \n" );
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Algebra.Com's Answer #474516 by Edwin McCravy(20056)![]() ![]() You can put this solution on YOUR website! \r\n" ); document.write( "2x-8 ≧ 0\r\n" ); document.write( "\r\n" ); document.write( "add 8 to both sides\r\n" ); document.write( "\r\n" ); document.write( " 2x ≧ 8\r\n" ); document.write( "\r\n" ); document.write( "divide both sides by 2, which is a positive number so you DO NOT\r\n" ); document.write( "reverse the inequality symbol from ≧ to ≦. You only reverse the \r\n" ); document.write( "symbol when you divide by a negative number, NEVER when you divide \r\n" ); document.write( "by a positive number. So it's\r\n" ); document.write( "\r\n" ); document.write( " x ≧ 4\r\n" ); document.write( "\r\n" ); document.write( "Why did you get \"less than\"? You must have learned the rule\r\n" ); document.write( "wrong and thought you reverse the symbol of inequality when you \r\n" ); document.write( "divide by a positive. No, you only reverse it when you divide by\r\n" ); document.write( "a negative number, but you DO NOT reverse it when you divide by a\r\n" ); document.write( "positive number.\r\n" ); document.write( "\r\n" ); document.write( "Edwin\n" ); document.write( " |