document.write( "Question 689023: What is a function? \n" ); document.write( "

Algebra.Com's Answer #425817 by MathLover1(20849) $\"\"$ $\"About$

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\n" ); document.write( "\n" ); document.write( "It is like a machine that has an $\"input\"$ and an $\"output\"$ , and the $\"output\"$ is $\"related\"$ somehow to the $\"input\"$ .\r
\n" ); document.write( "\n" ); document.write( " $\"f%28x%29\"$ = .........is the classic way of writing a function\r
\n" ); document.write( "\n" ); document.write( "The most common name is \" $\"f\"$ \", but you can have other names like \" $\"g\"$ \" or whatever you want to name it.\r
\n" ); document.write( "\n" ); document.write( "Sometimes a function has $\"no\"$ $\"+name\"$ , and you might just have:\r
\n" ); document.write( "\n" ); document.write( " $\"y+=+x%5E2\"$ \r
\n" ); document.write( "\n" ); document.write( "but there is still:\r
\n" ); document.write( "\n" ); document.write( " an $\"input\"$ ... ( $\"x\"$ )
\n" ); document.write( " a $\"relationship\"$ .... ( $\"squaring\"$ )
\n" ); document.write( " and an $\"output\"$ ...... ( $\"y\"$ )
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