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  • Explain Solution for RD Sharma Maths Class 12 Chapter 6 Adjoint and inverse of a Matrix Exercise very short answer type Question 21 maths textbook solution

Explain Solution for RD Sharma Maths Class 12 Chapter 6 Adjoint and inverse of a Matrix Exercise very short answer type Question 21 maths textbook solution

Answers (1)

VSQ : 21

Answer : 110

Given : $$ A=\left[\begin{array}{ccc} 2 & -3 & 5 \\ 6 & 0 & 4 \\ 1 & 5 & -7 \end{array}\right]

Hint : you must know about how to calculate cofactor of an element 

Solution : $$ A=\left[\begin{array}{ccc} 2 & -3 & 5 \\ 6 & 0 & 4 \\ 1 & 5 & -7 \end{array}\right] 

$$ \begin{aligned} &c_{32}=(-1)^{3+2}(8-30) \\ &=-1(-22) \\ &=22 \\ &a_{32}=5 \\ &a_{32} c_{32}=22(5) \\ &=110 \end{aligned}

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