Question 2 - Quadaratic equation - Chapter 4 Class 11 Complex Numbers

Last updated at August 17, 2026 by

Ex 5.3, 2 slide 1.jpg

Ex 5.3, 2 - Chapter 5 Class 11 Complex Numbers - Part 2

Remove Ads Take short quiz All Quiz and Worksheets
Teachoo · Class 11 Explore Class 11

Transcript

Question 2 Solve the equation 2𝑥2 + 𝑥 + 1 = 0 2x2 + x + 1 = 0 The above equation is of the form 𝑎𝑥2 + 𝑏𝑥 + 𝑐 = 0 Where a = 2 , b = 1 , c = 1 𝑥 = (−𝑏 ± √( 𝑏^2 − 4𝑎𝑐 ))/2𝑎 = (−1 ± √((1)^2 − 4 × 2 × 1))/(2 × 2) = (−1± √(1 − 8))/4 = (−1± √( − 7))/4 = (−1 ± √(−1 × 7))/4 = (−1 ± √(−1 × 7))/4 = (−1 ± √(−1 )× √7)/4 = (−1 ± √7 𝑖)/4 Thus, 𝑥 = (−1 ± √7 𝑖)/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.