document.write( "Question 1020039: Solve for x , show work please. Can someone check my answers please.\r
\n" ); document.write( "\n" ); document.write( "1). log4 (3x+4)^5=15 \r
\n" ); document.write( "\n" ); document.write( "2). log (x^2-9)=log (5x+5) \r
\n" ); document.write( "\n" ); document.write( "Here is a screenshot of them just incase. Link to screenshot : http://prntscr.com/a42nsg \r
\n" ); document.write( "\n" ); document.write( "my answer for #1 was no solution and my answer for #2 was x=7. Thanks ! \n" ); document.write( "

Algebra.Com's Answer #636000 by Cromlix(4381) $\"\"$ $\"About$

You can put this solution on YOUR website!
Hi there,
\n" ); document.write( "1) log4 (3x+4)^5=15
\n" ); document.write( "(3x + 4)^5 = 4^15
\n" ); document.write( "(3x + 4)^5 = 1073741824
\n" ); document.write( "3x + 4 = 5√1073741824
\n" ); document.write( "3x + 4 = 64
\n" ); document.write( "3x = 60
\n" ); document.write( "x = 20
\n" ); document.write( "2) log (x^2-9)=log (5x+5)
\n" ); document.write( "As both sides logs
\n" ); document.write( "x^2 - 9 - 5x - 5 = 0
\n" ); document.write( "x^2 - 5x - 14 = 0
\n" ); document.write( "(x - 7)(x + 2) = 0
\n" ); document.write( "x - 7 = 0
\n" ); document.write( "x = 7
\n" ); document.write( "x + 2 = 0
\n" ); document.write( "x = -2
\n" ); document.write( "Hope this helps :-) \n" ); document.write( "

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