The determinant of matrix \(\begin{pmatrix} x & 1 & 0 \\ 1-x & 2 & 3 \\ 1 & 1+x & 4 \end{pmatrix}\) in terms of x is

Assessment: JAMB UTME - Mathematics - 1998 Subject: General Mathematics

Question 1 Report

The determinant of matrix \(\begin{pmatrix} x & 1 & 0 \\ 1-x & 2 & 3 \\ 1 & 1+x & 4 \end{pmatrix}\) in terms of x is

Answer Details
| x 1 0 1 − x 2 3 1 1 + x 4 |  = x | 2 3 1 + x 4 |  -  | 1 − x 3 1 4 |  = 0
= x[8 - 3(1 + x)] - [4(1 - x)-3] - 0 = x[5 - 3x] - [1 - 4x]
= 5x - 3x2 -1 + 4x
= -3x2 + 9X - 1

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