document.write( "Question 993994: 2^2x+1-15(2^x)=8 \n" ); document.write( "

Algebra.Com's Answer #613191 by anand429(138) $\"\"$ $\"About$

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$\"2%5E%282x%2B1%29-15%282%5Ex%29=8\"$
\n" ); document.write( "=> $\"2%2A2%5E%282x%29-15%282%5Ex%29=8\"$
\n" ); document.write( "=> $\"2y%5E2-15y-8=0\"$ (Taking 2^x =y)
\n" ); document.write( "=> $\"%28y-8%29%282y%2B1%29=0\"$
\n" ); document.write( "=> $\"y=8\"$ or $\"y=-1%2F2\"$
\n" ); document.write( "=> $\"2%5Ex=8\"$ or $\"2%5Ex=+-1%2F2\"$
\n" ); document.write( "=> x=3 (Since 2^x can not be negative.) \n" ); document.write( "

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