document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=108230>Question 108230</A>: <I><SPAN STYLE=\"word-break: break-all;\"> 1. Find \"x\" for these 2 problems<BR>\n" );
document.write( "a)9^2x=2*(9^x)+3<BR>\n" );
document.write( "b)3*(3^x)+9*(3^-x)=28\r<BR>\n" );
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document.write( "ive graduated 2years ago and i dont remember how to do those 2 problems<BR>\n" );
document.write( "id like to know how to solve them step by step thanks<BR>\n" );
document.write( "yours<BR>\n" );
document.write( "brian </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #78891 by </B><A HREF=/tutors/aboutme.mpl?userid=scott8148><B>scott8148(6628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=scott8148><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=scott8148><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=78891\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> a) let z=9^x ... z^2=2z+3 ... z^2-2z-3=0 ... (z-3)(z+1)=0 ... z=3, z=-1<BR>\n" );
document.write( " ... the negative value is not realistic ... 3=9^x ... x=1/2\r<BR>\n" );
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document.write( "b) multiplying by 3^x gives 3*(3^x)^2+9=28(3^x) ... the method of solution is similar to a) </SPAN>\n" );
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