CBSE Class 12 Sample Paper for 2021 Boards

CBSE Class 12 Sample Paper for 2020 Boards →
Class 12
Solutions of Sample Papers and Past Year Papers - for Class 12 Boards

Question 4 - CBSE Class 12 Sample Paper for 2021 Boards - Solutions of Sample Papers and Past Year Papers - for Class 12 Boards

Last updated at August 10, 2026 by

If A and B are matrices of order 3 × š‘› and š‘š × 5 respectively, then find the order of matrix 5A – 3B, given that it is defined.

If A and B are matrices of order 3 x n and m × 5 respectively, then

 

Remove Ads
Teachoo Ā· Class 12 Explore Class 12

Transcript

Question 4 If A and B are matrices of order 3 Ɨ š‘› and š‘š Ɨ 5 respectively, then find the order of matrix 5A ā€“ 3B, given that it is defined. The Order of matrices A and B are š“_(3 Ɨ š‘›) and šµ_(š‘š Ɨ 5) To find 5A āˆ’ 2B, The order of matrix A and B must be the same Thus, 3 Ɨ n = m Ɨ 5 Thus, n = 5 Therefore, order of (5A āˆ’ 2B) is 3 Ɨ 5

Davneet Singh's photo - Co-founder, Teachoo

Made by

Davneet Singh

Davneet Singh is an IIT Kanpur graduate and has been teaching for 16+ years. At Teachoo, he breaks down Maths, Science and Computer Science into simple steps so students understand concepts deeply and score with confidence.

Many students prefer Teachoo Black for a smooth, ad-free learning experience.