document.write( "Question 171585: Determine the restricted value(s).
\n" ); document.write( "x^2-4x-21/x^2+16 \n" ); document.write( "

Algebra.Com's Answer #126739 by monika_p(71) $\"\"$ $\"About$

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$\"%28x%5E2-4x-21%29%2F%28x%5E2%2B16%29\"$
\n" ); document.write( "denominator can not be =0 (you can not divide by 0)
\n" ); document.write( "first lets check when x^2+16=0
\n" ); document.write( "x^2=-16 false ( squared number can not be equal to a negative number)
\n" ); document.write( "that means that all values of x from set of R (real numbers) fulfill that expression and there is no restricted values \n" ); document.write( "

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