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Ex 5.1, 2 - Examine continuity of f(x) = 2x2 - 1 at x = 3

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Ex 5.1, 2 Examine the continuity of the function f (x) = 2x2 – 1 at x = 3. 𝑓(π‘₯) is continuous at x = 3 if lim┬(xβ†’3) 𝑓(π‘₯) = 𝑓(3) Since, L.H.S = R.H.S Hence, f is continuous at 𝒙 =3 (π₯𝐒𝐦)┬(π±β†’πŸ‘) 𝒇(𝒙) "= " lim┬(xβ†’3) " "(2π‘₯2βˆ’1) Putting π‘₯ = 3 = 2(3)2 βˆ’ 1 = 2 Γ— 9 βˆ’ 1 = 17 𝒇(πŸ‘) = 2(3)2 βˆ’ 1 = 2 Γ— 9 βˆ’ 1 = 18βˆ’1 = 17

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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.