document.write( "Question 860626: 3^2x +3^x = 12 \n" ); document.write( "

Algebra.Com's Answer #518547 by Alan3354(69443) $\"\"$ $\"About$

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3^2x +3^x = 12
\n" ); document.write( "---------
\n" ); document.write( "Sub u for 3^x
\n" ); document.write( " $\"u%5E2+%2B+u+-+12+=+0\"$
\n" ); document.write( "(u+4)*(u-3) = 0
\n" ); document.write( "u = -4 --> 3^x = -4 extraneous, ignore
\n" ); document.write( "------
\n" ); document.write( "u = 3 --> 3^x = 3
\n" ); document.write( "x = 1
\n" ); document.write( " \n" ); document.write( "

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