Question

if A=[123
115
247]
then find the value of a31A31 + a32A32 + a33A33​

Answer 1

Answer:

Given matrix is A=⎣⎢⎢⎡112214357⎦⎥⎥⎤ 

a31=2,a32=4,a33=7

A31=10−3=7,A32=5−3=2,A33=1−2=−1

 ⟹a31A31+a32A32+a33A33=(7)(2)−(4)(2)+(7)(−1)=−1 

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