4 •6 - - 5 6

It looks like you have a 2x2 determinant with matrix [[4, 6], [5, 6]].

Compute ad − bc:

• ad = 4 × 6 = 24
• bc = 6 × 5 = 30
• det = ad − bc = 24 − 30 = -6

So, the value is -6.

If you meant something else (e.g., a fraction or a different arrangement), let me know and I’ll adjust.