Ex 5.3, 6 - Solve x2 - x + 2 = 0 - Class 11 CBSE - Quadaratic equation

Ex 5.3, 6 - Chapter 5 Class 11 Complex Numbers - Part 2

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Transcript

Ex5.3, 6 Solve the equation 𝑥2 – 𝑥 + 2 = 0 x2 – x + 2 = 0 The above equation is of the form 𝑎𝑥2 + 𝑏𝑥 + 𝑐 = 0 Where a = 1 , b = –1 , c = 2 x = (−𝑏 ± √( 𝑏^2 −4𝑎𝑐 ))/2𝑎 x = (−(−1) ± √((−1)^2 − 4 × 1 × 2))/(2 × 1) = (1 ± √(1−8))/2 = (1 ± √(−7))/2 = (1 ± √(−1 × 7))/2 = (1± √(−1) ×√7)/2 = (1 ± √7 𝑖)/2 Thus, 𝑥 = (1 ± √7 𝑖)/2

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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.