If −1 is a zero of the polynomial p(x) = x 2   − 7x − 8 , then the other zero is

(a) −8  (b) −7     (c) 1       (d) 8

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  1. Class 10
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Transcript

Question 17 If −1 is a zero of the polynomial p(x) = x2 − 7x − 8 , then the other zero is (a) −8 (b) −7 (c) 1 (d) 8 Given p(x) = x2 − 7x − 8 Since −1 is zero of polynomial Let 𝛼 = −1, and 𝛽 be zeros of p(x) Now, Product of Zeros = 𝑐/𝑎 −1 × 𝛽 = (−8)/1 𝛽 = 8 Thus, other zero is 8 So, the correct answer is (d)

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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.