Question 779540
{{{ 7 / ( n-4 ) + 8 / ( 4-n ) }}}
Multiply the top and bottom of the 2nd
term by {{{ -1 }}}
{{{ 7 / ( n-4 ) + (-8) / (-1*( 4-n )) }}}
{{{ 7 / ( n-4 ) + (-8) / ( n-4 ) }}}
You can factor out {{{ 1/( n-4 ) }}}
{{{ ( 1/( n-4 ) )*( 7 - 8 ) }}}
{{{ -1 / ( n-4 ) }}}
You can get rid of the negative sign also
{{{ 1 / (-1*( n-4 )) }}}
{{{ 1 / ( 4-n ) }}} answer
OK