document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=234338>Question 234338</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I am supposed to solve:\r<BR>\n" );
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document.write( "sqrt with the radicand 5x +21, then = x+3. So the question is:\r<BR>\n" );
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document.write( "sqrt 5x+21=x+3 </SPAN>\n" );
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document.write( "sqrt with the radicand 5x +21, then = x+3. So the question is: <BR>\n" );
document.write( "sqrt(5x+21) = x+3<BR>\n" );
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document.write( "Square both sides to get:<BR>\n" );
document.write( "5x+21 = x^2 + 6x + 9<BR>\n" );
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document.write( "Then x^2 + x - 12 = 0<BR>\n" );
document.write( "(x+4)(x-3) = 0<BR>\n" );
document.write( "x = -4 or x = 3<BR>\n" );
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document.write( "Since you squared, you have to check for extraneous answers.<BR>\n" );
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document.write( "Checking x = -4 you get:<BR>\n" );
document.write( "sqrt(-20+21) = -4+3<BR>\n" );
document.write( "sqrt(1) = -1<BR>\n" );
document.write( "1 = -1 <BR>\n" );
document.write( "False ; so x = -4 is extraneous<BR>\n" );
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document.write( "Checking x = 3 you get:<BR>\n" );
document.write( "sqrt(15+21) = 3+3<BR>\n" );
document.write( "sqrt(36) = 6<BR>\n" );
document.write( "6 = 6<BR>\n" );
document.write( "-----------------------------<BR>\n" );
document.write( "Final Answer: x = 3<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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