document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=215011>Question 215011</A>: <I><SPAN STYLE=\"word-break: break-all;\"> How to solve 42 = -21t + 4.9t^2 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #162472 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=162472\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> solve 42 = -21t + 4.9t^2<BR>\n" );
document.write( "4.9t^2 - 21t - 42 = 0<BR>\n" );
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document.write( "Use the Quadratic Formula:<BR>\n" );
document.write( "t = [21 +- sqrt(21^2 - 4*4.9*-42)]/9.8<BR>\n" );
document.write( "---<BR>\n" );
document.write( "t = [21 +- sqrt(1264)]/9.8<BR>\n" );
document.write( "--<BR>\n" );
document.write( "t = [21 +- 35.56]/9.8<BR>\n" );
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document.write( "t = [21+35.56]/9.8 or t = [21-35.56]/9.8<BR>\n" );
document.write( "--<BR>\n" );
document.write( "t = 0.5771... or -1.486..<BR>\n" );
document.write( "============================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );