given the equation (in the picture)

I asked to Proof that the left side are equal to the right side.

I know how to proof that the right side are equal to the left side,but not vice versa.

hope you can help.

thanks.

Can you post your prof for right to left? I may be able to help but its been along time since I have done boolean algebra. I know its equal by using the laws and substution of values for letters, but I need to see more of what your looking for to help. Sorry its just been to long since I have done this in school.

sure I can show you.

(A+C)(A+D)(B+C)(B+D)=
[(A+C)(A+D)][(B+C)(B+D)]=
[AA+AD+CA+CD][BB+BD+CB+CD]=
[A(1+D+C)+CD][B(1+D+B)+CD]=
[A+CD][B+CD]=AB+ACD+BCD+CDCD=
AB+CD(A+B+1)=
AB+CD

I am not sure if I 100% correct.

thanks.