Find the inverse \( \begin{vmatrix} 5 & 3 \\ 6 & 4 \end{vmatrix} \)

Assessment: JAMB UTME - Mathematics - 2013 Subject: General Mathematics

Question 1 Report

Find the inverse \( \begin{vmatrix} 5 & 3 \\ 6 & 4 \end{vmatrix} \)

Answer Details
Let A =  ( 5 3 6 4 )
Then |A| =  ( 5 3 6 4 )  = 20 - 18 = 2
Hence A-1 =  1 | A | ( 4 − 3 − 6 5 )
=  1 2 ( 4 − 3 − 6 5 )
=  ( 4 × 1 / 2 − 3 × 1 / 2 − 6 × 1 / 2 5 × 1 / 2 )
= 

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