Take Right side
Show that (a^2 + b^2)(c^2 + d^2) = (ac – bd)^2 + (ad + bc)^2. Hence, or otherwise, write the number 17000 as the sum of two squares in two different ways.
Can someone please help me on this? I've expanded the first equation but I can't seem to be able to factorise it into the other equation.