document.write( "Question 1017508: For the function f(x)=x^2 -12, find (f o f^-1)(4) the answear is a.6 b.4 c.0 D 10. Im keep getting 10,i dunno ot right can u please help me thank u. \n" ); document.write( "

Algebra.Com's Answer #633789 by macston(5194) $\"\"$ $\"About$

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\n" ); document.write( " $\"f%28x%29=y\"$ = $\"x%5E2-12\"$
\n" ); document.write( " $\"f%5E%28-1%29\"$ : $\"x=y%5E2-12\"$
\n" ); document.write( " $\"y%5E2=x%2B12\"$
\n" ); document.write( " $\"y=sqrt%28x%2B12%29\"$
\n" ); document.write( ".
\n" ); document.write( " $\"For\"$ $\"x=4\"$ :
\n" ); document.write( " $\"y=sqrt%284%2B12%29\"$ = $\"sqrt%2816%29=4\"$
\n" ); document.write( ".
\n" ); document.write( " $\"Since\"$ $\"f%5E%28-1%29=4\"$ , ( $\"f+o\"$ $\"f%5E%28-1%29\"$ )= $\"f%284%29\"$
\n" ); document.write( ".
\n" ); document.write( " $\"f%284%29=4%5E2-12=16-12=4\"$
\n" ); document.write( ".\r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

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