document.write( "Question 942773: Solve for x.
\n" ); document.write( " a.) 7^x+1 + 7^x + 7^x-1 = 399
\n" ); document.write( " b.) (4^x+2)(5^x+1) = 32000
\n" ); document.write( " c.) (2^x-3)(5^x+1) = 625 \n" ); document.write( "

Algebra.Com's Answer #574769 by Fombitz(32388) $\"\"$ $\"About$

You can put this solution on YOUR website!
Don't forget to use parentheses around the exponents.
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\n" ); document.write( "a) $\"7%5E%28x%2B1%29+%2B+7%5Ex+%2B+7%5E%28x-1%29+=+399\"$
\n" ); document.write( " $\"49%2A7%5E%28x-1%29%2B7%2A7%5E%28x-1%29%2B7%5E%28x-1%29=399\"$
\n" ); document.write( " $\"%2857%297%5E%28x-1%29=399\"$
\n" ); document.write( " $\"7%5E%28x-1%29=7\"$
\n" ); document.write( " $\"x-1=1\"$
\n" ); document.write( " $\"x=2\"$
\n" ); document.write( ".
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\n" ); document.write( "b) $\"4%5E%28x%2B2%295%5E%28x%2B1%29=32000\"$
\n" ); document.write( " $\"16%2A4%5Ex%2A5%2A5%5Ex=32000\"$
\n" ); document.write( " $\"20%5Ex=400\"$
\n" ); document.write( " $\"x=2\"$
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\n" ); document.write( "c) $\"2%5E%28x-3%295%5E%28x%2B1%29=625\"$
\n" ); document.write( " $\"%281%2F2%5E3%29%2A2%5Ex%2A5%2A5%5Ex=625\"$
\n" ); document.write( " $\"%281%2F8%29%2A2%5Ex%2A5%2A5%5Ex=625\"$
\n" ); document.write( " $\"10%5Ex=1000\"$
\n" ); document.write( " $\"x=3\"$ \n" ); document.write( "

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