If one zero of the quadratic polynomial x2 + 3x + k is 2, then the value of k is

(A) 10       (B) –10             (C) 5             (D) –5

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Question 1 If one zero of the quadratic polynomial x2 + 3x + k is 2, then the value of k is (A) 10 (B) –10 (C) 5 (D) –5 Let p(x) = x2 + 3x + k Since 2 is a zero of p(x) p(2) = 0 22 + 3(2) + k = 0 4 + 6 + k = 0 10 + k = 0 k = −10 So, the correct answer is (B)

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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.