document.write( "Question 468408: Please help me find the domain to this function
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Algebra.Com's Answer #321422 by lwsshak3(11628)\"\" \"About 
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Please help me find the domain to this function
\n" ); document.write( "sqrt(x^2-2x-8)
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\n" ); document.write( "The expression inside a radical must always be ≥0
\n" ); document.write( "x^2-2x-8≥0
\n" ); document.write( "f(x)=(x-4)(x+2)≥0
\n" ); document.write( "If x≥4, f(x)≥0
\n" ); document.write( "If x≤2, f(x)≥0
\n" ); document.write( "If x<4, f(x)<0
\n" ); document.write( "If x>2, f(x)<0
\n" ); document.write( "Domain: (-∞,2] U [4,∞)
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