No products in the cart.

find k if -2 is zero …

CBSE, JEE, NEET, CUET

Question Bank, Mock Tests, Exam Papers

NCERT Solutions, Sample Papers, Notes, Videos

find k if -2 is zero of polynomial 4x^2-x+k

Posted by Priya Kalra 5 years, 5 months ago

Priya Kalra 5 years, 5 months ago

x = -2
f(x) = 4x²-x+k
4(-2)² - (-2)+ k = 0
4(4) + 4 + k = 0
16 + 4 + k = 0
20 + k = 0
k = -20

You have written 4 but I think here must be 2 instead of 4

Yogita Ingle 5 years, 5 months ago

x = -2
f(x) = 4x²-x+k
4(-2)² - (-2)+ k = 0
4(4) + 4 + k = 0
16 + 4 + k = 0
20 + k = 0
k = -20

ANSWER

Related Questions

2x+5y

Posted by Yash Pandey 3 months, 3 weeks ago

CBSE > Class 09 > Mathematics

3√2×4√2×12√32

Posted by Manas Khurana 3 months, 3 weeks ago

CBSE > Class 09 > Mathematics

Ch-1 introduction

Posted by Sheikh Alfaz 1 month ago

CBSE > Class 09 > Mathematics

The polynomial of the type ax²+bx+c,a=0 is called

Posted by Gnani Yogi 3 months, 3 weeks ago

CBSE > Class 09 > Mathematics

X³-12x²+39x-28

Posted by Sukhi Devasi 3 months, 3 weeks ago

CBSE > Class 09 > Mathematics

Posted by Kirshika Ganesh 3 months, 2 weeks ago

CBSE > Class 09 > Mathematics

Don't post personal information, mobile numbers and other details.
Don't use this platform for chatting, social networking and making friends. This platform is meant only for asking subject specific and study related questions.
Be nice and polite and avoid rude and abusive language. Avoid inappropriate language and attention, vulgar terms and anything sexually suggestive. Avoid harassment and bullying.
Ask specific question which are clear and concise.

Posted by T Prudhvi 4 weeks, 2 days ago

CBSE > Class 09 > Mathematics