# Simplify : (4m − 8n)2 + (7m + 8n)2 - Mathematics

Simplify : (4m − 8n)2 + (7m + 8n)2

#### Solution

To simplify, we will proceed as follows:

$\left( 7m - 8n \right)^2 + \left( 7m + 8n \right)^2$

$= 2 \left( 7m \right)^2 + 2 \left( 8n \right)^2 \left[ \because \left( a - b \right)^2 + \left( a + b \right)^2 = 2 a^2 + 2 b^2 \right]$

$= 98 m^2 + 128 n^2$

Concept: Multiplication of Algebraic Expressions
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#### APPEARS IN

RD Sharma Class 8 Maths
Chapter 6 Algebraic Expressions and Identities
Exercise 6.6 | Q 19.3 | Page 44