How do you factor #7x + 7y + rx + ry#?
Apr 5, 2016
(x + y)(7 +r)
group the terms into 'pairs' as follows :
[ 7x + 7y ] + [ rx + ry ]
now factor each pair
hence: 7(x + y ) + r(x + y )
There is a common factor of (x + y) which can be taken out.
thus: (x + y)(7 + r)