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**Find the determinant of the following 4x4 matrix**

-1 0 0 0

-15 7 -15 5

-5 1 -6 1

6 -7 6 -5

**Here is my attempt**

Ive seen that I should do the following:

-1.(determinant of 3x3 matrix)-0.(determinant of 3x3 matrix) + 0.(determinant of 3x3 matrix)-0.(determinant of 3x3 matrix)

which would simplify to

-1.(determinat of 3x3 matrix)

IS THIS CORRECT??