Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • School
  • Need solution for RD Sharma maths class 12 chapter 4 Algebra of Matrices exercise Fill in the blank question 43

Need solution for RD Sharma maths class 12 chapter 4 Algebra of Matrices exercise Fill in the blank question 43

Answers (1)

Answer:

 3

Hint:

 For this we must aware with matrix multiplication concept

Given:

 \begin{aligned} &{\left[\begin{array}{lll} 3 & -2 & 0 \end{array}\right]\left[\begin{array}{c} 2 \\ k \\ -5 \end{array}\right]=0} \\ &\text { Find } k=\text { ? } \end{aligned}

Solution:

\begin{aligned} &{\left[\begin{array}{lll} 3 & -2 & 0 \end{array}\right]\left[\begin{array}{c} 2 \\ k \\ -5 \end{array}\right]=0} \\ \end{aligned}

Here 1st has 3 columns and 2nd has 3 rows

So, matrix multiplication is possible

\begin{aligned} &{\left[\begin{array}{lll} 3 & -2 & 0 \end{array}\right]\left[\begin{array}{c} 2 \\ k \\ -5 \end{array}\right]=0} \\ &{[6+(-2 k)+0]=0} \\ &6-2 k=0 \\ &k=3 \end{aligned}

 

Posted by

Gurleen Kaur

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 Class 12 board exams 2025 to have 50% competency-based questions; no change in 10th
anam-khan

CBSE Class 12 board exams 2024 over; expected result date, trends of last 10 years
anam-khan

CBSE Class 12 accountancy board exam analysis 2024 out; paper rated easy, balanced

Latest Question