Question

Alguem?

Sendo: $A= \left[\begin{array}{ccc}5&0&-1\\3&2&-4\\-2&7&1\end{array}\right] calcule:\\detA$

Answer 1

A = $\left[\begin{array}{ccc}5&0&-1\\3&2&-4\\-2&7&1\end{array}\right]$
Det A = (5 · 2 · 1) + [0 · (-4) · (-2)] + [(-1) · 3 · 7] - [(-2) · 2 · (-1)] - [7 · (-4) · 5] - [1 · 3 ·0]
Det A = 10 + 0 + [-21] - 4 - [-140] - 0
Det A = 10 + 0 - 21 - 4 +140 - 0
Det A = 125