document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=395136>Question 395136</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A foul ball leaves a bat, hits home plate, and travels straight up with an initial volocity of the rebound of 64 ft/s.  How many seconds later will the ball be 64 ft above the ground.I figured it out till I factored out the 16 and then got lost.<BR>\n" );
document.write( "H=64t-16t^2<BR>\n" );
document.write( "64=64t-16t^2 has 64 subtracted from both sides and becomes the following:<BR>\n" );
document.write( "0=-16t^2+64t-64<BR>\n" );
document.write( "0=16(t^2+4t-4)<BR>\n" );
document.write( "I saw that the first and last terms were squares and so tried to see if it were a perfect square trinomial: (t-2)^2 <BR>\n" );
document.write( "but when I started the checking process the 2t(-2)=-4 but our middle term is positive four so it isn't a perfect square trinomial, I included right here how I began to check to see if the middle term would come out recalling the pattern for finding the square of a binomial, square of the first term, twice the product of the two terms, square of the last term(Courtesy.,Introductory Algebra: An Applied Approach (a+b)^2+a^2+2ab+b^2 <BR>\n" );
document.write( "so following what I spoke of above my problem looked like this(t)2+2(t)(-2)-(2)^2but I realized while lookingat the final term, that the final term if -(2)^2 would be -2*-2=4 not the negative four I needed.  <BR>\n" );
document.write( "So the second thing I started was trying out the different combination of numbers-but became confused because I needed to have a negative 2 and a positive 2 to come out with a negative four but when plugged in (t+2)(t-2)comes to zero and not the positive four I need. I tried +4-1 and vice versa and nothing worked out so I figured I had done something wrong somewhere </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #280440 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=280440\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A foul ball leaves a bat, hits home plate, and travels straight up with an initial volocity of the rebound of 64 ft/s. How many seconds later will the ball be 64 ft above the ground.I figured it out till I factored out the 16 and then got lost.<BR>\n" );
document.write( "H=64t-16t^2<BR>\n" );
document.write( "64=64t-16t^2 has 64 subtracted from both sides and becomes the following:<BR>\n" );
document.write( "0=-16t^2+64t-64<BR>\n" );
document.write( "---<BR>\n" );
document.write( "Comment: You ignored the negative on the 16.<BR>\n" );
document.write( "------<BR>\n" );
document.write( "0 = -16(t^2-4t+4)<BR>\n" );
document.write( "---<BR>\n" );
document.write( "t^2-4t+4 = 0<BR>\n" );
document.write( "(t-2) = 0<BR>\n" );
document.write( "t = 2<BR>\n" );
document.write( "============<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );