Check sibling questions

Ex 9.4, 1 (vi) - Chapter 9 Class 8 Algebraic Expressions and Identities

Last updated at March 16, 2023 by

Ex 9.4, 1 (vi) - Multiply (3/4 a^2 + 3 b^2) and 4 (a^2 - 2/3 b^2)

Ex 9.4, 1 (vi) - Chapter 9 Class 8 Algebraic Expressions and Identities - Part 2

This video is only available for Teachoo black users

Subscribe Now

Get live Maths 1-on-1 Classs - Class 6 to 12

Book 30 minute class for ₹ 499 ₹ 299

Transcript

Ex 9.4, 1 Multiply the binomials. (vi) (3/4 𝑎^2+3𝑏^2 ) and 4(𝑎^2−2/3 𝑏^2 ) (3/4 𝑎^2+3𝑏^2 )×4(𝑎^2−2/3 𝑏^2 ) = (3/4 𝑎^2+3𝑏^2 )×[(4×𝑎^2 )−(4×2/3 𝑏^2 )] = (3/4 𝑎^2+3𝑏^2 )×(4𝑎^2−8/3 𝑏^2 ) = 3/4 𝑎^2 (4𝑎^2−8/3 𝑏^2 )+3𝑏^2 (4𝑎^2−8/3 𝑏^2 ) = (3/4 𝑎^2×4𝑎^2 )−(3/4 𝑎^2×8/3 𝑏^2 )+(3𝑏^2×4𝑎^2 )−(3𝑏^2×8/3 𝑏^2 ) = 3𝑎^4−2𝑎^2 𝑏^2+12𝑏^2 𝑎^2−8𝑏^4

Ask a doubt
Davneet Singh's photo - Co-founder, Teachoo

Made by

Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.