2 is not a composite number as it can't be divided rather than 1 or other number.
hope it helps!
Associative Property states that grouping symbols does not affect the outcome. This property works for Addition and Multiplication:
2 + (3 + 4) = (2 + 3) + 4
6 • (5 • 4) = (6 • 5) • 4
Lets say the 3x3 Matrix is
M = [1 5 2 ]
[1 1 7 ]
[0 -3 7 ]
We apply the Gauss-Jordan elimination method
(Procedure and result shown in the image below)
(a²-6)(a²-4) simplify
a⁴-4a²-6a²+24
Combine like terms
a⁴-10a²+24