4. Simplify. (iv) (4m + 5n)^2 + (5m + 4n)^2 4. Simplify. (iv) (4m + 5n)^2 + (5m + 4n)^2 October 12, 2020 Category: Chapter 9 - Algebraic Expressions and Identities , Maths , NCERT Class 8 , Facebook Messenger WhatsApp Share this:TwitterFacebook Related