document.write( "Question 746492: if 4^x+4^x-1=10 find x \n" ); document.write( "
Algebra.Com's Answer #454363 by Alan3354(69443)\"\" \"About 
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if 4^x+4^x-1=10 find x
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\n" ); document.write( "I think you mean
\n" ); document.write( "if 4^x+4^(x-1) = 10 find x
\n" ); document.write( "Use parentheses to make things unambiguous.
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\n" ); document.write( "if 4^x+4^x-1=10 find x
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\n" ); document.write( "Sub y for 4^(x-1)
\n" ); document.write( "4y + y = 10
\n" ); document.write( "y = 2
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\n" ); document.write( "4^(x-1) = 2
\n" ); document.write( "(x-1)*log(4) = log(2)
\n" ); document.write( "x = 1 + log(2)/log(4)
\n" ); document.write( "x = 1.5 \n" ); document.write( "
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