Question 135889
{-3 4 -4}
{-3 K -1} = 58
{1 4 -2} 
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The left side is a determinant.
You are evaluate the determinant; set it equal to 58; solve for K.
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Determinant Value: [-3*K*-2+-3*4*-4 + 1*-1*4] 
-[-4*K*1 + -1*4*-3 + -2*-3*4] =58

= [6K+48-4] - [-4K+12+24] = 58

= 10K+8 = 58
10K = 50
K= 5
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Cheers,
Stan H.