bjr

(2x+3)(5-3x)+(2x+3)(5+2x)

=(2x+3) (5-3x + (5+2x)

= (2x+3) (-x+10)

bonjour

( 2 x + 3 ) ( 5 - 3 x ) + ( 2 x + 3 ) ( 5 + 2 x )

= ( 2 x + 3 ) ( 5 - 3 x + 5 + 2 x )

= ( 2 x + 3 ) ( - x + 10 )