Question 4, Exercise 2.2
Solutions of Question 4 of Exercise 2.2 of Unit 02: Matrices and Determinants. This is unit of A Textbook of Mathematics for Grade XI is published by Khyber Pakhtunkhwa Textbook Board (KPTB or KPTBB) Peshawar, Pakistan.
Question 4(i)
Evaluate the determinant |013−121211|.
Solution
|013−121211|=0(2−1)−1(−1−2)+3(−1−4)=0+3−15=−12
Question 4(ii)
Evaluate the determinant |34−224−6420|.
Solution
|34−224−6−420|=3(0+12)−4(0−24)−2(4+16)=36+96−80=52
Question 4(iii)
Evaluate the determinant |3126−54−98−7|.
Solution
|3126−54−98−7|=3(35−32)−1(−42+36)+2(48−45)=9+6+6=21
Question 4(iv)
Evaluate the determinant |21−3110−234|.
Solution
|21−3110−234|=2(4−0)−1(4−0)−3(3+2)=8−4−15=−11
Go To