Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • School
  • Explain solution rd sharma class 12 chapter adjoint and inverse of a matrix exercise multiple choice question question 28

Explain solution rd sharma class 12 chapter adjoint and inverse of a matrix exercise multiple choice question question 28

Answers (1)

best_answer

option (d) none of these

Given: 3 A^{3}+2A^{2}+5A+I=0

Hint: use simple calculation to get the result.

\begin{aligned} &\text { Solution: } 3 A^{3}+2 A^{2}+5 A=-I \\ &A\left(3 A^{2}+2 A+5 I\right)=-I \\ &3 A^{2}+2 A+5 I=-A^{-1}\left(\text { multiply } A^{-1}\right. \text { on both sides) } \\ &\Rightarrow A^{-1}=-\left(3 A^{2}+2 A+5 I\right) \end{aligned}

Hence, option (d) is correct

 

Posted by

Info Expert 29

View full answer

Crack CUET with india's "Best Teachers"

  • HD Video Lectures
  • Unlimited Mock Tests
  • Faculty Support
cuet_ads

Similar Questions

Trending Articles/News

anam-khan

CBSE Supplementary Exam 2025: Registrations open for Class 10, 12 private students today
anam-khan

CBSE opens application to access 10th answer scripts; verification, revaluation for Class 12 starts on May 31
anam-khan

CBSE supplementary exams 2025 from July 15; form submission starts on May 30

Latest Question