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
Last updated at July 23, 2021 by Teachoo
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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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