nomor 9 mohon sama cara nya

jawab
matriks

det A = 4(-3) - 1(-8)
det A = -12 + 8
det A = -4

A⁻¹  = 1/det A [-3...8||-1..4}

A⁻¹ =  -1/4  [3...8 || -1...4]

A⁻¹ = [ (-3/4)...-2|| (1/4)...-1]

(jawab C)