I've tried creating a triangular matrix, tried row reducing but can't figure it out as I keep on having c-unknown in my answer. How would I do this? 
2026-04-01 14:32:56.1775053976
Find Determinant of A
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Hint:
Expanding along column 1 or row 4 (since they each have two zeros), we arrive at:
$$\det A = -20 - 5 c$$
Can you take it from here?
What part does this determinant play in the inverse of a matrix? Recall that
$$A^{-1} = \dfrac{1}{\det A} adj(A)$$
What does that mean for the value of $c$?