Asked by Jenny

Find the variable for the following 3x3 matrix.


|x 3 -1
2 1 -2
4 1 x|

Note: This entire matrix =10
Answered by Jenny
I need help with this ASAP. Thanks so much!
Answered by Reiny
Did you mean the determinant of the matrix is 10 ?
Answered by Jenny
Yes.
Answered by Reiny
I don't know what method you have learned to find the determinant, but I get
x^2 - 4x - 22 = 10
x^2 - 4x - 32 = 0
(x-8)(x+4) = 0

x=8 or x=-4
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