Check sibling questions

CBSE Class 10 Sample Paper for 2022 Boards - Maths Basic [MCQ]

CBSE Class 10 Sample Paper for 2021 Boards - Maths Standard →
Class 10
Solutions of Sample Papers for Class 10 Boards

Question 17 - CBSE Class 10 Sample Paper for 2022 Boards - Maths Basic [MCQ] - Solutions of Sample Papers for Class 10 Boards

Last updated at March 22, 2023 by

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

Slide28.JPG

Slide29.JPG

This video is only available for Teachoo black users

Subscribe Now

Get live Maths 1-on-1 Classs - Class 6 to 12

Book 30 minute class for ₹ 499 ₹ 299

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)

Ask a doubt
Davneet Singh's photo - Co-founder, Teachoo

Made by

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.