document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=107758>Question 107758</A>: <I><SPAN STYLE=\"word-break: break-all;\">                                 /-------<BR>\n" );
document.write( "Find the domain of f (x) = 7 + /3x + 21 , and express it using interval<BR>\n" );
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document.write( "a. [–7, &#8734;)<BR>\n" );
document.write( "b. [0, &#8734;)<BR>\n" );
document.write( "c. [7, &#8734;)<BR>\n" );
document.write( "d. [21, &#8734;) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #78529 by </B><A HREF=/tutors/aboutme.mpl?userid=Nate><B>Nate(3500)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Nate><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=78529\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> f(x) = 7 + sqrt(3x + 21)<BR>\n" );
document.write( "You can not take the square root of a negative value and receive a real value in return. So:<BR>\n" );
document.write( "3x + 21 >= 0<BR>\n" );
document.write( "3x >= -21<BR>\n" );
document.write( "x >= -7<BR>\n" );
document.write( "A </SPAN>\n" );
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