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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  1. Chapter 2 Class 10 Polynomials (Term 1)
  2. Serial order wise

Transcript

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 is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 10 years. He provides courses for Maths and Science at Teachoo.