SOLUTION: givin am+cn Mb=Nd Prove ab+cd

You can put this solution on YOUR website!
The way you have written this problem makes no sense. Given am+cn? am+cn equals what? Also, was there a figure included?

Now, if you just made a mistake typing and meant:
Given and then prove , then there is no solution. That is because with the given relations, in general. It can be proven that however.