It is 6+xz. The expression cannot be evaluated, factorised nor simplified. Since it is neither an equation nor an inequality, it cannot be solved. So the point of this question completely escapes me!
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There appear to be 10 terms in the determinant. A determinant can only have a perfect number of terms. So something has gone wrong with the question. 1: x2 plus 1 2: xy 3: xz 4: xy 5: y2 plus 1 6: yz 7: 1 plus x2 plus y2 plus z2 8: xz 9: yz 10: z2 plus 1
6x12=72+654=726+555= 1281
36:)
6x5
( 6 + 6 ) + ( 6 + 8 ) + ( 5 + 8 ) = 39