Question 3 (i) - Examples - Chapter 8 Class 8 Algebraic Expressions and Identities

Last updated at August 13, 2026 by

Example 13 - Using Identity (III), find (i) (3/2 m + 2/3n) (ii) 983^2

 

Remove Ads

Transcript

Example 13 Using Identity (III), find (i) (3/2 𝑚+2/3 𝑛)(3/2 𝑚−2/3 𝑛) (3/2 𝑚+2/3 𝑛)(3/2 𝑚−2/3 𝑛) (𝑎+𝑏)(𝑎−𝑏)=𝑎^2−𝑏^2 Putting 𝑎 = 3/2 𝑚 & 𝑏 = 2/3 𝑛 = (3/2 𝑚)^2−(2/3 𝑛)^2 = (3/2)^2×𝑚^2−(2/3)^2×𝑛^2 = 𝟗/𝟒 𝒎^𝟐−𝟒/𝟗 𝒏^𝟐

Davneet Singh's photo - Co-founder, Teachoo

Made by

Davneet Singh

Davneet Singh is an IIT Kanpur graduate and has been teaching for 16+ years. At Teachoo, he breaks down Maths, Science and Computer Science into simple steps so students understand concepts deeply and score with confidence.

Many students prefer Teachoo Black for a smooth, ad-free learning experience.