document.write( "Question 971870: Find domain for f(x)=3x+5, f(x)=3x/x+4 \n" ); document.write( "
Algebra.Com's Answer #594280 by nerdybill(7384)\"\" \"About 
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\"Domain\" specifies all the values that 'x' can take
\n" ); document.write( "for
\n" ); document.write( "f(x)=3x+5:
\n" ); document.write( "domain is all real numbers
\n" ); document.write( "or in interval notation:
\n" ); document.write( "(-oo, +oo)
\n" ); document.write( "where oo is for infinity
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\n" ); document.write( "for
\n" ); document.write( "f(x)=3x/x+4
\n" ); document.write( "because we can't divide by zero
\n" ); document.write( "we set the denominator to zero and solve for x (defines values x can't take)
\n" ); document.write( "x+4=0
\n" ); document.write( "x = -4
\n" ); document.write( "domain is all real numbers except -4
\n" ); document.write( "or, in interval notation:
\n" ); document.write( "(-oo,-4) U (-4, +oo)
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