No products in the cart.

Show that n² -1 is divisible …

CBSE, JEE, NEET, CUET

Question Bank, Mock Tests, Exam Papers

NCERT Solutions, Sample Papers, Notes, Videos

Install Now

Show that n² -1 is divisible by 8 .If n is an odd positive integer.

Posted by Rohit Kamal 6 years, 10 months ago

CBSE > Class 10 > Mathematics

2 answers

Esha Pal 6 years, 10 months ago

Refer to RD Sharma book if u have....?

0Thank You

Yogita Ingle 6 years, 10 months ago

If 'n' is an odd positive integer, show that (n²-1) Is divisible by 8
Any odd positive integer is in the form of 4p + 1 or 4p+ 3 for some integer p.
Let n = 4p+ 1,
(n² – 1) = (4p + 1)² – 1 = 16p² + 8p + 1 = 16p² + 8p = 8p (2p + 1)
⇒ (n² – 1) is divisible by 8.
(n² – 1) = (4p + 3)² – 1 = 16p² + 24p + 9 – 1 = 16p² + 24p + 8 = 8(2p² + 3p + 1)
⇒ n²– 1 is divisible by 8.
Therefore, n²– 1 is divisible by 8 if n is an odd positive integer.

2Thank You

ANSWER

Test

Related Questions

sin60° cos 30°+ cos60° sin 30°

Posted by Vanshika Bhatnagar 1 year, 5 months ago

CBSE > Class 10 > Mathematics

2 answers

This content has been hidden. One or more users have flagged this content as inappropriate. Once content is flagged, it is hidden from users and is reviewed by myCBSEguide team against our Community Guidelines. If content is found in violation, the user posting this content will be banned for 30 days from using Homework help section. Suspended users will receive error while adding question or answer. Question comments have also been disabled. Read community guidelines at https://mycbseguide.com/community-guidelines.html

Few rules to keep homework help section safe, clean and informative.

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.

Remember the goal of this website is to share knowledge and learn from each other. Ask questions and help others by answering questions.

Posted by Hari Anand 6 months, 2 weeks ago

CBSE > Class 10 > Mathematics

0 answers

X-y=5

Posted by Kishan Thakur 1 month, 1 week ago

CBSE > Class 10 > Mathematics

1 answers

Venu Gopal has twice

Posted by Lakshay Kumar 1 year, 1 month ago

CBSE > Class 10 > Mathematics

0 answers

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.

Remember the goal of this website is to share knowledge and learn from each other. Ask questions and help others by answering questions.

Posted by Kanika . 1 month, 1 week ago

CBSE > Class 10 > Mathematics