document.write( "Question 951878: Find all solutions of the equation
\n" ); document.write( "e^x − 30 e^(−x) = −7\r
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\n" ); document.write( "\n" ); document.write( "If there is more than one answer, enter them in a list separated by commas. IMPORTANT: Decimal answers will be marked incorrect. Enter an EXACT, symbolic answer (such as 3/2, not 1.5, or ln(2), not .693)
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Algebra.Com's Answer #581334 by josmiceli(19441)\"\" \"About 
You can put this solution on YOUR website!
\"+e%5Ex+-+30e%5E%28-x%29+=+-7+\"
\n" ); document.write( "Multiply both sides by \"+%281%2F30%29%2Ae%5Ex+\"
\n" ); document.write( "\"+%281%2F30%29%2Ae%5E%282x%29+-+1+=+-7%2A%281%2F30%29%2Ae%5Ex+\"
\n" ); document.write( "\"+%281%2F30%29%2Ae%5E%282x%29+%2B+7%2A%281%2F30%29%2Ae%5Ex+-+1+=+0+\"
\n" ); document.write( "\"+e%5E%282x%29+%2B+7e%5Ex+-+30+=+0+\"
\n" ); document.write( "\"+%28+e%5Ex+%2B+10+%29%2A%28+e%5Ex+-+3+%29+=+0+\"
\n" ); document.write( "------------------------------
\n" ); document.write( "\"+e%5Ex+=+-10+\"
\n" ); document.write( "Take the natural log of both sides
\n" ); document.write( "\"+x+=+ln%28-10%29+\"
\n" ); document.write( "There is no log to the base \"e\" that gives
\n" ); document.write( "a negative number, so I can' t solve this
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\n" ); document.write( "\"+e%5Ex+=+3+\"
\n" ); document.write( "\"+x+=+ln%283%29+\"
\n" ); document.write( "----------------
\n" ); document.write( "check:
\n" ); document.write( "\"+e%5Ex+-+30e%5E%28-x%29+=+-7+\"
\n" ); document.write( "\"+3+-+30%2A%28+1%2F3%29+=+-7+\"
\n" ); document.write( "\"+3+-+10+=+-7+\"
\n" ); document.write( "\"+-7+=+-7+\"
\n" ); document.write( "OK
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