document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1026727>Question 1026727</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Determine the x-coordinate at which the maximum/ or minimum occurs for the function f(x) = -3x^2 + 30X -30 Also find the coordinates of the vertx. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #641998 by </B><A HREF=/tutors/aboutme.mpl?userid=Boreal><B>Boreal(15235)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Boreal><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/cgi-bin/show-face.mpl?user=Boreal><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=641998\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\">  f(x) = -3x^2 + 30X -30<BR>\n" );
document.write( "x coordinate of vertex is -b/2a= -30/-6 or 5 and it is a maximum, because the coefficient of the square term is minus.<BR>\n" );
document.write( "f(x)=-75+150-30=45.<BR>\n" );
document.write( "(5,45) is the maximum.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=graph%28300%2C200%2C-10%2C10%2C-250%2C250%2C-3x%5E2%2B30x-30%29 ALIGN=MIDDLE  ALT=\"graph%28300%2C200%2C-10%2C10%2C-250%2C250%2C-3x%5E2%2B30x-30%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
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