Question

Please help ASAP !!! Thank you !

Answer 1

(1)

=(a+b)(3c-d)

=a(3c-d)+b(3c-d)

=3ac-ad+3bc-bd

(2)

=(a-b)(c+2d)

=a(c+2d)-b(c+2d)

=ac+2ad-bc-2bd

(3)

=(a-b)(c-2d)

=a(c-2d)-b(c-2d)

=ac-2ad-bc+2bd

(4)

=(2a+b)(c-3d)

=2a(c-3d)+b(c-3d)

=2ac-6ad+bc-3bd