Question

Please help to find if this is a matrix or an absolute value and explain what the answer is. I am not sure I understand this.

Answer 1

Explanation:

this you solve via the determinant of the matrix.

for a matrix A

a b

c d

the determinant (A) = ad - bc

so, we have here

x² - 5×-4 = 24

x² + 20 = 24

x² = 4

x = ±2

so, as a simple quadratic equation, there are 2 solutions for x.