Question

Evaluate: (200 – 5)2 30,285/ 30825 /38025/ 30225 which option​

Answer 1

First we will find minor of second row.

M21=9−16=−7

M22=15−8=7

M23=10−3=7

Now, we will find the cofactors using these minors.

A21=(−1)2+1M21=−1(−7)=7

A22=(−1)2+2M22=1(7)=7

A23=(−1)2+3M23=−1(7)=−7

Now, a21=2

a22=0

a23=1

∴Δ=a21A21+a22A22+a23A23

⇒Δ=2(7)+0(7)+1(−7)=14+0−7=7

∴Δ=7.

HOPE IT HELPS U :D