Question

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

Answer 1

$(2x+3)(3-r)-(2x-5)(3-r) \\ \\ (-2xr+2x.3-3r+3.3)-(-2xr+2x.3+5r-5.3) \\ \\ (-2xr+2.3x-3r+9)-(-2xr+2.3x+5r-15) \\ \\ (-2xr+6x-3r+9)-(-2xr+6x+5r-15) \\ \\ -2xr+6x-3r+9+2xr-6x-5r+15 \\ \\ -8r+24 \\ \\ Saludos$